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Номер 621, страница 181 - гдз по алгебре 9 класс учебник Солтан, Солтан
Авторы: Солтан Г. Н., Солтан А. Е., Жумадилова А. Ж.
Тип: Учебник
Издательство: Кокшетау
Год издания: 2019 - 2026
ISBN: 978-601-317-424-2
Рекомендовано Министерством образования и науки Республики Казахстан
Популярные ГДЗ в 9 классе
IV. Тригонометрия. 23. Тригонометрические функции и их свойства - номер 621, страница 181.
App\Models\Task {#1030 // resources/views/models/task/default.blade.php #connection: "mysql" #table: "tasks" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 1108356 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "181" "field_page_end" => null "field_url" => "/9-klass/algebra/kokshetau-soltan-uchebnik/1-621" "field_display_title" => "621" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1037 #items: array:1 [ 0 => App\Models\Term {#1036 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 26 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "номер" "field_cases" => array:6 [ "field_accusative_case" => "номер" "field_creative_case" => "номером" "field_dative_case" => "номеру" "field_genitive_case" => "номера" "field_nominative_case" => "номер" "field_prepositional_case" => "номере" ] "field_short_name" => "№" ] #original: array:6 [ "id" => 26 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "номер" "field_cases" => array:6 [ "field_accusative_case" => "номер" "field_creative_case" => "номером" "field_dative_case" => "номеру" "field_genitive_case" => "номера" "field_nominative_case" => "номер" "field_prepositional_case" => "номере" ] "field_short_name" => "№" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1035 #items: [] #escapeWhenCastingToString: false } "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1071 #items: array:1 [ 0 => App\Models\Branch {#1034 #connection: "mysql" #table: "branches" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 1107662 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_display_title" => "IV. Тригонометрия" "field_branch_order" => null "field_url" => null "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1039 #items: [] #escapeWhenCastingToString: false } "field_page_start" => "147" "field_branch_display" => "0" "field_branch_expanded" => "0" "field_display_branch_in_title" => "1" "field_display_task_interval" => "0" "field_display_branch_page" => "1" "field_branch_title_in_content" => "0" "field_navigation_title" => null "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_branch_cover" => [] "field_branch_covers" => [] "book" => Illuminate\Database\Eloquent\Collection {#1038 #items: array:1 [ 0 => App\Models\Book {#1040 #connection: "mysql" #table: "books" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:50 [ "id" => 4298 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_tree_default_status" => "tasks" "field_pages_status" => null "field_subject" => Illuminate\Database\Eloquent\Collection {#1041 …2} "field_class" => Illuminate\Database\Eloquent\Collection {#1043 …2} "field_publisher" => Illuminate\Database\Eloquent\Collection {#1045 …2} "field_author" => Illuminate\Database\Eloquent\Collection {#1047 …2} "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1051 …2} "field_book_type" => Illuminate\Database\Eloquent\Collection {#1052 …2} "field_country" => Illuminate\Database\Eloquent\Collection {#1054 …2} "field_city" => Illuminate\Database\Eloquent\Collection {#1056 …2} "field_series" => Illuminate\Database\Eloquent\Collection {#1058 …2} "field_umk" => Illuminate\Database\Eloquent\Collection {#1059 …2} "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1060 …2} "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1061 …2} "field_publication_number" => null "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1062 …2} "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1063 …2} "field_under_the_edition_degree" => null "field_cover_description" => null "field_publication_year" => "2019" "field_publication_year_until" => null "field_part" => "" "field_part_writing" => "" "field_second_foreign_language" => null "field_for_whom" => "Учебник для учащихся 9 класса общеобразовательных школ" "field_allowed" => "Рекомендовано Министерством образования и науки Республики Казахстан" "field_reserve_field" => null "field_link_to_source" => null "field_tasks_count" => "1291" "field_priority" => "4" "field_default_folder" => "/algebra_09/soltan-u19/" "field_isbn" => "978-601-317-424-2" "field_cover" => array:1 [ …1] "field_cover_alts" => array:1 [ …1] "field_covers" => array:1 [ …1] "field_popular_book" => null "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1064 …2} "field_new_book" => Illuminate\Database\Eloquent\Collection {#1065 …2} "field_old_book" => Illuminate\Database\Eloquent\Collection {#1066 …2} "field_url" => "/9-klass/algebra/kokshetau-soltan-uchebnik" "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1067 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "breadcrumbs" => array:3 [ …3] ] #original: array:50 [ "id" => 4298 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_tree_default_status" => "tasks" "field_pages_status" => null "field_subject" => Illuminate\Database\Eloquent\Collection {#1041 …2} "field_class" => Illuminate\Database\Eloquent\Collection {#1043 …2} "field_publisher" => Illuminate\Database\Eloquent\Collection {#1045 …2} "field_author" => Illuminate\Database\Eloquent\Collection {#1047 …2} "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1051 …2} "field_book_type" => Illuminate\Database\Eloquent\Collection {#1052 …2} "field_country" => Illuminate\Database\Eloquent\Collection {#1054 …2} "field_city" => Illuminate\Database\Eloquent\Collection {#1056 …2} "field_series" => Illuminate\Database\Eloquent\Collection {#1058 …2} "field_umk" => Illuminate\Database\Eloquent\Collection {#1059 …2} "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1060 …2} "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1061 …2} "field_publication_number" => null "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1062 …2} "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1063 …2} "field_under_the_edition_degree" => null "field_cover_description" => null "field_publication_year" => "2019" "field_publication_year_until" => null "field_part" => "" "field_part_writing" => "" "field_second_foreign_language" => null "field_for_whom" => "Учебник для учащихся 9 класса общеобразовательных школ" "field_allowed" => "Рекомендовано Министерством образования и науки Республики Казахстан" "field_reserve_field" => null "field_link_to_source" => null "field_tasks_count" => "1291" "field_priority" => "4" "field_default_folder" => "/algebra_09/soltan-u19/" "field_isbn" => "978-601-317-424-2" "field_cover" => array:1 [ …1] "field_cover_alts" => array:1 [ …1] "field_covers" => array:1 [ …1] "field_popular_book" => null "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1064 …2} "field_new_book" => Illuminate\Database\Eloquent\Collection {#1065 …2} "field_old_book" => Illuminate\Database\Eloquent\Collection {#1066 …2} "field_url" => "/9-klass/algebra/kokshetau-soltan-uchebnik" "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1067 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "breadcrumbs" => array:3 [ …3] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "branch_parent" => Illuminate\Database\Eloquent\Collection {#1068 #items: [] #escapeWhenCastingToString: false } ] #original: array:24 [ "id" => 1107662 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_display_title" => "IV. Тригонометрия" "field_branch_order" => null "field_url" => null "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1039} "field_page_start" => "147" "field_branch_display" => "0" "field_branch_expanded" => "0" "field_display_branch_in_title" => "1" "field_display_task_interval" => "0" "field_display_branch_page" => "1" "field_branch_title_in_content" => "0" "field_navigation_title" => null "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_branch_cover" => [] "field_branch_covers" => [] "book" => Illuminate\Database\Eloquent\Collection {#1038} "branch_parent" => Illuminate\Database\Eloquent\Collection {#1068} ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "parent_branches" => Illuminate\Database\Eloquent\Collection {#1166 #items: array:2 [ 0 => App\Models\Branch {#1069 #connection: "mysql" #table: "branches" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 1107662 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_display_title" => "IV. Тригонометрия" "field_branch_order" => null "field_url" => null "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1072 #items: [] #escapeWhenCastingToString: false } "field_page_start" => "147" "field_branch_display" => "0" "field_branch_expanded" => "0" "field_display_branch_in_title" => "1" "field_display_task_interval" => "0" "field_display_branch_page" => "1" "field_branch_title_in_content" => "0" "field_navigation_title" => null "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_branch_cover" => [] "field_branch_covers" => [] "book" => Illuminate\Database\Eloquent\Collection {#1070 #items: array:1 [ 0 => App\Models\Book {#1073 #connection: "mysql" #table: "books" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:50 [ "id" => 4298 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_tree_default_status" => "tasks" "field_pages_status" => null "field_subject" => Illuminate\Database\Eloquent\Collection {#1074 …2} "field_class" => Illuminate\Database\Eloquent\Collection {#1076 …2} "field_publisher" => Illuminate\Database\Eloquent\Collection {#1078 …2} "field_author" => Illuminate\Database\Eloquent\Collection {#1080 …2} "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1084 …2} "field_book_type" => Illuminate\Database\Eloquent\Collection {#1085 …2} "field_country" => Illuminate\Database\Eloquent\Collection {#1087 …2} "field_city" => Illuminate\Database\Eloquent\Collection {#1089 …2} "field_series" => Illuminate\Database\Eloquent\Collection {#1091 …2} "field_umk" => Illuminate\Database\Eloquent\Collection {#1092 …2} "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1093 …2} "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1094 …2} "field_publication_number" => null "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1095 …2} "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1096 …2} "field_under_the_edition_degree" => null "field_cover_description" => null "field_publication_year" => "2019" "field_publication_year_until" => null "field_part" => "" "field_part_writing" => "" "field_second_foreign_language" => null "field_for_whom" => "Учебник для учащихся 9 класса общеобразовательных школ" "field_allowed" => "Рекомендовано Министерством образования и науки Республики Казахстан" "field_reserve_field" => null "field_link_to_source" => null "field_tasks_count" => "1291" "field_priority" => "4" "field_default_folder" => "/algebra_09/soltan-u19/" "field_isbn" => "978-601-317-424-2" "field_cover" => array:1 [ …1] "field_cover_alts" => array:1 [ …1] "field_covers" => array:1 [ …1] "field_popular_book" => null "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1097 …2} "field_new_book" => Illuminate\Database\Eloquent\Collection {#1098 …2} "field_old_book" => Illuminate\Database\Eloquent\Collection {#1099 …2} "field_url" => "/9-klass/algebra/kokshetau-soltan-uchebnik" "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1100 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "breadcrumbs" => array:3 [ …3] ] #original: array:50 [ "id" => 4298 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_tree_default_status" => "tasks" "field_pages_status" => null "field_subject" => Illuminate\Database\Eloquent\Collection {#1074 …2} "field_class" => Illuminate\Database\Eloquent\Collection {#1076 …2} "field_publisher" => Illuminate\Database\Eloquent\Collection {#1078 …2} "field_author" => Illuminate\Database\Eloquent\Collection {#1080 …2} "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1084 …2} "field_book_type" => Illuminate\Database\Eloquent\Collection {#1085 …2} "field_country" => Illuminate\Database\Eloquent\Collection {#1087 …2} "field_city" => Illuminate\Database\Eloquent\Collection {#1089 …2} "field_series" => Illuminate\Database\Eloquent\Collection {#1091 …2} "field_umk" => Illuminate\Database\Eloquent\Collection {#1092 …2} "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1093 …2} "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1094 …2} "field_publication_number" => null "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1095 …2} "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1096 …2} "field_under_the_edition_degree" => null "field_cover_description" => null "field_publication_year" => "2019" "field_publication_year_until" => null "field_part" => "" "field_part_writing" => "" "field_second_foreign_language" => null "field_for_whom" => "Учебник для учащихся 9 класса общеобразовательных школ" "field_allowed" => "Рекомендовано Министерством образования и науки Республики Казахстан" "field_reserve_field" => null "field_link_to_source" => null "field_tasks_count" => "1291" "field_priority" => "4" "field_default_folder" => "/algebra_09/soltan-u19/" "field_isbn" => "978-601-317-424-2" "field_cover" => array:1 [ …1] "field_cover_alts" => array:1 [ …1] "field_covers" => array:1 [ …1] "field_popular_book" => null "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1097 …2} "field_new_book" => Illuminate\Database\Eloquent\Collection {#1098 …2} "field_old_book" => Illuminate\Database\Eloquent\Collection {#1099 …2} "field_url" => "/9-klass/algebra/kokshetau-soltan-uchebnik" "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1100 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "breadcrumbs" => array:3 [ …3] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "branch_parent" => Illuminate\Database\Eloquent\Collection {#1101 #items: [] #escapeWhenCastingToString: false } ] #original: array:24 [ "id" => 1107662 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_display_title" => "IV. Тригонометрия" "field_branch_order" => null "field_url" => null "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1072} "field_page_start" => "147" "field_branch_display" => "0" "field_branch_expanded" => "0" "field_display_branch_in_title" => "1" "field_display_task_interval" => "0" "field_display_branch_page" => "1" "field_branch_title_in_content" => "0" "field_navigation_title" => null "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_branch_cover" => [] "field_branch_covers" => [] "book" => Illuminate\Database\Eloquent\Collection {#1070} "branch_parent" => Illuminate\Database\Eloquent\Collection {#1101} ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 1 => App\Models\Branch {#1102 #connection: "mysql" #table: "branches" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 1107665 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_display_title" => "23. Тригонометрические функции и их свойства" "field_branch_order" => null "field_url" => null "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1103 #items: [] #escapeWhenCastingToString: false } "field_page_start" => "172" "field_branch_display" => "0" "field_branch_expanded" => "0" "field_display_branch_in_title" => "1" "field_display_task_interval" => "0" "field_display_branch_page" => "1" "field_branch_title_in_content" => "0" "field_navigation_title" => null "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_branch_cover" => [] "field_branch_covers" => [] "book" => Illuminate\Database\Eloquent\Collection {#1104 #items: array:1 [ 0 => App\Models\Book {#1105 #connection: "mysql" #table: "books" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:50 [ "id" => 4298 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_tree_default_status" => "tasks" "field_pages_status" => null "field_subject" => Illuminate\Database\Eloquent\Collection {#1106 …2} "field_class" => Illuminate\Database\Eloquent\Collection {#1108 …2} "field_publisher" => Illuminate\Database\Eloquent\Collection {#1110 …2} "field_author" => Illuminate\Database\Eloquent\Collection {#1112 …2} "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1116 …2} "field_book_type" => Illuminate\Database\Eloquent\Collection {#1117 …2} "field_country" => Illuminate\Database\Eloquent\Collection {#1119 …2} "field_city" => Illuminate\Database\Eloquent\Collection {#1121 …2} "field_series" => Illuminate\Database\Eloquent\Collection {#1123 …2} "field_umk" => Illuminate\Database\Eloquent\Collection {#1124 …2} "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1125 …2} "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1126 …2} "field_publication_number" => null "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1127 …2} "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1128 …2} "field_under_the_edition_degree" => null "field_cover_description" => null "field_publication_year" => "2019" "field_publication_year_until" => null "field_part" => "" "field_part_writing" => "" "field_second_foreign_language" => null "field_for_whom" => "Учебник для учащихся 9 класса общеобразовательных школ" "field_allowed" => "Рекомендовано Министерством образования и науки Республики Казахстан" "field_reserve_field" => null "field_link_to_source" => null "field_tasks_count" => "1291" "field_priority" => "4" "field_default_folder" => "/algebra_09/soltan-u19/" "field_isbn" => "978-601-317-424-2" "field_cover" => array:1 [ …1] "field_cover_alts" => array:1 [ …1] "field_covers" => array:1 [ …1] "field_popular_book" => null "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1129 …2} "field_new_book" => Illuminate\Database\Eloquent\Collection {#1130 …2} "field_old_book" => Illuminate\Database\Eloquent\Collection {#1131 …2} "field_url" => "/9-klass/algebra/kokshetau-soltan-uchebnik" "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1132 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "breadcrumbs" => array:3 [ …3] ] #original: array:50 [ "id" => 4298 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_tree_default_status" => "tasks" "field_pages_status" => null "field_subject" => Illuminate\Database\Eloquent\Collection {#1106 …2} "field_class" => Illuminate\Database\Eloquent\Collection {#1108 …2} "field_publisher" => Illuminate\Database\Eloquent\Collection {#1110 …2} "field_author" => Illuminate\Database\Eloquent\Collection {#1112 …2} "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1116 …2} "field_book_type" => Illuminate\Database\Eloquent\Collection {#1117 …2} "field_country" => Illuminate\Database\Eloquent\Collection {#1119 …2} "field_city" => Illuminate\Database\Eloquent\Collection {#1121 …2} "field_series" => Illuminate\Database\Eloquent\Collection {#1123 …2} "field_umk" => Illuminate\Database\Eloquent\Collection {#1124 …2} "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1125 …2} "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1126 …2} "field_publication_number" => null "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1127 …2} "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1128 …2} "field_under_the_edition_degree" => null "field_cover_description" => null "field_publication_year" => "2019" "field_publication_year_until" => null "field_part" => "" "field_part_writing" => "" "field_second_foreign_language" => null "field_for_whom" => "Учебник для учащихся 9 класса общеобразовательных школ" "field_allowed" => "Рекомендовано Министерством образования и науки Республики Казахстан" "field_reserve_field" => null "field_link_to_source" => null "field_tasks_count" => "1291" "field_priority" => "4" "field_default_folder" => "/algebra_09/soltan-u19/" "field_isbn" => "978-601-317-424-2" "field_cover" => array:1 [ …1] "field_cover_alts" => array:1 [ …1] "field_covers" => array:1 [ …1] "field_popular_book" => null "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1129 …2} "field_new_book" => Illuminate\Database\Eloquent\Collection {#1130 …2} "field_old_book" => Illuminate\Database\Eloquent\Collection {#1131 …2} "field_url" => "/9-klass/algebra/kokshetau-soltan-uchebnik" "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1132 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "breadcrumbs" => array:3 [ …3] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "branch_parent" => Illuminate\Database\Eloquent\Collection {#1133 #items: array:1 [ 0 => App\Models\Branch {#1134 #connection: "mysql" #table: "branches" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 1107662 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_display_title" => "IV. Тригонометрия" "field_branch_order" => null "field_url" => null "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1135 …2} "field_page_start" => "147" "field_branch_display" => "0" "field_branch_expanded" => "0" "field_display_branch_in_title" => "1" "field_display_task_interval" => "0" "field_display_branch_page" => "1" "field_branch_title_in_content" => "0" "field_navigation_title" => null "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_branch_cover" => [] "field_branch_covers" => [] "book" => Illuminate\Database\Eloquent\Collection {#1136 …2} "branch_parent" => Illuminate\Database\Eloquent\Collection {#1165 …2} ] #original: array:24 [ "id" => 1107662 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_display_title" => "IV. Тригонометрия" "field_branch_order" => null "field_url" => null "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1135 …2} "field_page_start" => "147" "field_branch_display" => "0" "field_branch_expanded" => "0" "field_display_branch_in_title" => "1" "field_display_task_interval" => "0" "field_display_branch_page" => "1" "field_branch_title_in_content" => "0" "field_navigation_title" => null "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_branch_cover" => [] "field_branch_covers" => [] "book" => Illuminate\Database\Eloquent\Collection {#1136 …2} "branch_parent" => Illuminate\Database\Eloquent\Collection {#1165 …2} ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } ] #original: array:24 [ "id" => 1107665 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_display_title" => "23. Тригонометрические функции и их свойства" "field_branch_order" => null "field_url" => null "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1103} "field_page_start" => "172" "field_branch_display" => "0" "field_branch_expanded" => "0" "field_display_branch_in_title" => "1" "field_display_task_interval" => "0" "field_display_branch_page" => "1" "field_branch_title_in_content" => "0" "field_navigation_title" => null "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_branch_cover" => [] "field_branch_covers" => [] "book" => Illuminate\Database\Eloquent\Collection {#1104} "branch_parent" => Illuminate\Database\Eloquent\Collection {#1133} ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "content" => Illuminate\Database\Eloquent\Collection {#1176 #items: array:3 [ 0 => App\Models\Element {#1186 #connection: "mysql" #table: "elements" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:7 [ "id" => 1276976 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1195 #items: array:1 [ 0 => App\Models\Edition {#1187 #connection: "mysql" #table: "editions" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:21 [ "id" => 4953 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Условие" "field_order" => "1" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1189 …2} "field_content_type" => "free" "field_content_mode" => "text, image" "field_page_content_mode" => "image" "field_content_text_checked" => null "field_page_content_text_checked" => "0" "field_solution_author" => "Автор" "field_moderator" => "pasha" "field_edition_type" => "statement" "field_root_dir" => "0-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1190 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1191 …2} "field_process_formula" => "katex" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1192 …2} "field_content_source" => null ] #original: array:21 [ "id" => 4953 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Условие" "field_order" => "1" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1189 …2} "field_content_type" => "free" "field_content_mode" => "text, image" "field_page_content_mode" => "image" "field_content_text_checked" => null "field_page_content_text_checked" => "0" "field_solution_author" => "Автор" "field_moderator" => "pasha" "field_edition_type" => "statement" "field_root_dir" => "0-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1190 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1191 …2} "field_process_formula" => "katex" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1192 …2} "field_content_source" => null ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "task" => array:2 [ "refs" => "1108356" "type" => "task" ] "text" => "<p><strong>621.</strong> Установите, каким должно быть число a, чтобы выполнялось равенство:</p><p><strong>a)</strong> $ \sin x = \frac{4a - 3}{2 - a} $;</p><p><strong>б)</strong> $ \cos x = \frac{3a + 2}{3 - a} $;</p><p><strong>в)</strong> $ \sin x = \frac{a^2 - 3a + 2}{a^2 - 1} $;</p><p><strong>г)</strong> $ \cos x = \frac{a^2 - 4}{a^2 + a - 2} $;</p>" "img" => array:1 [ 0 => array:5 [ "name" => "621-1.jpg" "alt" => null "width" => "1563" "height" => 465 "path" => "/media/algebra_09/soltan-u19/0-1/621-1.webp?ts=1752834622" ] ] ] #original: array:7 [ "id" => 1276976 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1195} "task" => array:2 [ "refs" => "1108356" "type" => "task" ] "text" => "<p><strong>621.</strong> Установите, каким должно быть число a, чтобы выполнялось равенство:</p><p><strong>a)</strong> $ \sin x = \frac{4a - 3}{2 - a} $;</p><p><strong>б)</strong> $ \cos x = \frac{3a + 2}{3 - a} $;</p><p><strong>в)</strong> $ \sin x = \frac{a^2 - 3a + 2}{a^2 - 1} $;</p><p><strong>г)</strong> $ \cos x = \frac{a^2 - 4}{a^2 + a - 2} $;</p>" "img" => array:1 [ 0 => array:5 [ "name" => "621-1.jpg" "alt" => null "width" => "1563" "height" => 465 "path" => "/media/algebra_09/soltan-u19/0-1/621-1.webp?ts=1752834622" ] ] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 1 => App\Models\Element {#1193 #connection: "mysql" #table: "elements" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 1278267 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1203 #items: array:1 [ 0 => App\Models\Edition {#1194 #connection: "mysql" #table: "editions" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:21 [ "id" => 4954 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Решение" "field_order" => "2" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1197 …2} "field_content_type" => "free" "field_content_mode" => "image" "field_page_content_mode" => "" "field_content_text_checked" => "0" "field_page_content_text_checked" => "0" "field_solution_author" => "Неизвестный" "field_moderator" => "pasha" "field_edition_type" => "solution" "field_root_dir" => "1-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1198 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1199 …2} "field_process_formula" => "" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1200 …2} "field_content_source" => null ] #original: array:21 [ "id" => 4954 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Решение" "field_order" => "2" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1197 …2} "field_content_type" => "free" "field_content_mode" => "image" "field_page_content_mode" => "" "field_content_text_checked" => "0" "field_page_content_text_checked" => "0" "field_solution_author" => "Неизвестный" "field_moderator" => "pasha" "field_edition_type" => "solution" "field_root_dir" => "1-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1198 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1199 …2} "field_process_formula" => "" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1200 …2} "field_content_source" => null ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "task" => array:2 [ "refs" => "1108356" "type" => "task" ] "img" => array:3 [ 0 => array:5 [ "name" => "621-1.jpg" "alt" => null "width" => "1400" "height" => 1182 "path" => "/media/algebra_09/soltan-u19/1-1/621-1.webp?ts=1752831394" ] 1 => array:5 [ "name" => "621-2.jpg" "alt" => null "width" => "1460" "height" => 2301 "path" => "/media/algebra_09/soltan-u19/1-1/621-2.webp?ts=1752831394" ] 2 => array:5 [ "name" => "621-3.jpg" "alt" => null "width" => "1315" "height" => 1309 "path" => "/media/algebra_09/soltan-u19/1-1/621-3.webp?ts=1752831394" ] ] ] #original: array:6 [ "id" => 1278267 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1203} "task" => array:2 [ "refs" => "1108356" "type" => "task" ] "img" => array:3 [ 0 => array:5 [ "name" => "621-1.jpg" "alt" => null "width" => "1400" "height" => 1182 "path" => "/media/algebra_09/soltan-u19/1-1/621-1.webp?ts=1752831394" ] 1 => array:5 [ "name" => "621-2.jpg" "alt" => null "width" => "1460" "height" => 2301 "path" => "/media/algebra_09/soltan-u19/1-1/621-2.webp?ts=1752831394" ] 2 => array:5 [ "name" => "621-3.jpg" "alt" => null "width" => "1315" "height" => 1309 "path" => "/media/algebra_09/soltan-u19/1-1/621-3.webp?ts=1752831394" ] ] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 2 => App\Models\Element {#1201 #connection: "mysql" #table: "elements" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 1554222 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1211 #items: array:1 [ 0 => App\Models\Edition {#1202 #connection: "mysql" #table: "editions" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:21 [ "id" => 5665 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Решение 2 (rus)" "field_order" => "3" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1205 …2} "field_content_type" => "free" "field_content_mode" => "text" "field_page_content_mode" => "" "field_content_text_checked" => null "field_page_content_text_checked" => "0" "field_solution_author" => "Gemini 2.5 Pro" "field_moderator" => "tolik" "field_edition_type" => "solution" "field_root_dir" => "2-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1206 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1207 …2} "field_process_formula" => "katex" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1208 …2} "field_content_source" => null ] #original: array:21 [ "id" => 5665 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Решение 2 (rus)" "field_order" => "3" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1205 …2} "field_content_type" => "free" "field_content_mode" => "text" "field_page_content_mode" => "" "field_content_text_checked" => null "field_page_content_text_checked" => "0" "field_solution_author" => "Gemini 2.5 Pro" "field_moderator" => "tolik" "field_edition_type" => "solution" "field_root_dir" => "2-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1206 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1207 …2} "field_process_formula" => "katex" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1208 …2} "field_content_source" => null ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "task" => array:2 [ "refs" => "1108356" "type" => "task" ] "text" => "<p><strong>а)</strong> Чтобы равенство выполнялось, значение выражения в правой части должно принадлежать области значений функции синус, то есть отрезку $ [-1, 1] $. Кроме того, знаменатель дроби не должен быть равен нулю.</p><p>Получаем систему неравенств: $ \begin{cases} \frac{4a-3}{2-a} \ge -1 \\ \frac{4a-3}{2-a} \le 1 \end{cases} $ и условие $ 2-a \ne 0 $, то есть $ a \ne 2 $.</p><p>Решим первое неравенство: $ \frac{4a-3}{2-a} + 1 \ge 0 $ $ \frac{4a-3+2-a}{2-a} \ge 0 $ $ \frac{3a-1}{2-a} \ge 0 $ Решением этого неравенства методом интервалов является промежуток $ a \in [\frac{1}{3}, 2) $.</p><p>Решим второе неравенство: $ \frac{4a-3}{2-a} - 1 \le 0 $ $ \frac{4a-3-(2-a)}{2-a} \le 0 $ $ \frac{5a-5}{2-a} \le 0 $ $ \frac{5(a-1)}{2-a} \le 0 $ Решением этого неравенства является объединение промежутков $ a \in (-\infty, 1] \cup (2, +\infty) $.</p><p>Найдем пересечение полученных решений: $ a \in [\frac{1}{3}, 2) \cap ((-\infty, 1] \cup (2, +\infty)) $. Пересечением является отрезок $ [\frac{1}{3}, 1] $.</p><p><strong>Ответ:</strong> $a \in [\frac{1}{3}, 1]$.</p><hr><p><strong>б)</strong> Значение выражения в правой части должно принадлежать области значений функции косинус, то есть отрезку $ [-1, 1] $. Знаменатель дроби не должен быть равен нулю.</p><p>Получаем систему неравенств: $ \begin{cases} \frac{3a+2}{3-a} \ge -1 \\ \frac{3a+2}{3-a} \le 1 \end{cases} $ и условие $ 3-a \ne 0 $, то есть $ a \ne 3 $.</p><p>Решим первое неравенство: $ \frac{3a+2}{3-a} + 1 \ge 0 $ $ \frac{3a+2+3-a}{3-a} \ge 0 $ $ \frac{2a+5}{3-a} \ge 0 $ Решением этого неравенства является промежуток $ a \in [-\frac{5}{2}, 3) $.</p><p>Решим второе неравенство: $ \frac{3a+2}{3-a} - 1 \le 0 $ $ \frac{3a+2-(3-a)}{3-a} \le 0 $ $ \frac{4a-1}{3-a} \le 0 $ Решением этого неравенства является объединение промежутков $ a \in (-\infty, \frac{1}{4}] \cup (3, +\infty) $.</p><p>Найдем пересечение полученных решений: $ a \in [-\frac{5}{2}, 3) \cap ((-\infty, \frac{1}{4}] \cup (3, +\infty)) $. Пересечением является отрезок $ [-\frac{5}{2}, \frac{1}{4}] $.</p><p><strong>Ответ:</strong> $a \in [-\frac{5}{2}, \frac{1}{4}]$.</p><hr><p><strong>в)</strong> Выражение в правой части должно принадлежать отрезку $ [-1, 1] $. Найдем область допустимых значений $ a $. Знаменатель не может быть равен нулю: $ a^2-1 \ne 0 \implies (a-1)(a+1) \ne 0 \implies a \ne 1 $ и $ a \ne -1 $.</p><p>Упростим выражение в правой части, разложив числитель и знаменатель на множители: $ \sin x = \frac{a^2-3a+2}{a^2-1} = \frac{(a-1)(a-2)}{(a-1)(a+1)} = \frac{a-2}{a+1} $ при $ a \ne 1 $.</p><p>Теперь решаем двойное неравенство для упрощенного выражения: $ -1 \le \frac{a-2}{a+1} \le 1 $. Система неравенств: $ \begin{cases} \frac{a-2}{a+1} \ge -1 \\ \frac{a-2}{a+1} \le 1 \end{cases} $ при условии $ a \ne -1 $ и $ a \ne 1 $.</p><p>Первое неравенство: $ \frac{a-2}{a+1} + 1 \ge 0 \implies \frac{a-2+a+1}{a+1} \ge 0 \implies \frac{2a-1}{a+1} \ge 0 $. Решение: $ a \in (-\infty, -1) \cup [\frac{1}{2}, +\infty) $.</p><p>Второе неравенство: $ \frac{a-2}{a+1} - 1 \le 0 \implies \frac{a-2-(a+1)}{a+1} \le 0 \implies \frac{-3}{a+1} \le 0 $. Это неравенство верно, когда $ a+1 > 0 $, то есть $ a > -1 $. Решение: $ a \in (-1, +\infty) $.</p><p>Пересечение решений $ a \in ((-\infty, -1) \cup [\frac{1}{2}, +\infty)) \cap (-1, +\infty) $ дает $ a \in [\frac{1}{2}, +\infty) $. Учитывая исходное ограничение $ a \ne 1 $, получаем окончательный ответ.</p><p><strong>Ответ:</strong> $a \in [\frac{1}{2}, 1) \cup (1, +\infty)$.</p><hr><p><strong>г)</strong> Выражение в правой части должно принадлежать отрезку $ [-1, 1] $. Найдем ОДЗ: $ a^2+a-2 \ne 0 $. Корнями уравнения $ a^2+a-2 = 0 $ являются $ a_1=1 $ и $ a_2=-2 $. Значит, $ a \ne 1 $ и $ a \ne -2 $.</p><p>Упростим выражение: $ \cos x = \frac{a^2-4}{a^2+a-2} = \frac{(a-2)(a+2)}{(a-1)(a+2)} = \frac{a-2}{a-1} $ при $ a \ne -2 $.</p><p>Решаем двойное неравенство: $ -1 \le \frac{a-2}{a-1} \le 1 $. Система неравенств: $ \begin{cases} \frac{a-2}{a-1} \ge -1 \\ \frac{a-2}{a-1} \le 1 \end{cases} $ при условии $ a \ne 1 $ и $ a \ne -2 $.</p><p>Первое неравенство: $ \frac{a-2}{a-1} + 1 \ge 0 \implies \frac{a-2+a-1}{a-1} \ge 0 \implies \frac{2a-3}{a-1} \ge 0 $. Решение: $ a \in (-\infty, 1) \cup [\frac{3}{2}, +\infty) $.</p><p>Второе неравенство: $ \frac{a-2}{a-1} - 1 \le 0 \implies \frac{a-2-(a-1)}{a-1} \le 0 \implies \frac{-1}{a-1} \le 0 $. Это неравенство верно, когда $ a-1 > 0 $, то есть $ a > 1 $. Решение: $ a \in (1, +\infty) $.</p><p>Пересечение решений $ a \in ((-\infty, 1) \cup [\frac{3}{2}, +\infty)) \cap (1, +\infty) $ дает $ a \in [\frac{3}{2}, +\infty) $. Этот промежуток удовлетворяет всем исходным ограничениям.</p><p><strong>Ответ:</strong> $a \in [\frac{3}{2}, +\infty)$.</p>" ] #original: array:6 [ "id" => 1554222 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1211} "task" => array:2 [ "refs" => "1108356" "type" => "task" ] "text" => "<p><strong>а)</strong> Чтобы равенство выполнялось, значение выражения в правой части должно принадлежать области значений функции синус, то есть отрезку $ [-1, 1] $. Кроме того, знаменатель дроби не должен быть равен нулю.</p><p>Получаем систему неравенств: $ \begin{cases} \frac{4a-3}{2-a} \ge -1 \\ \frac{4a-3}{2-a} \le 1 \end{cases} $ и условие $ 2-a \ne 0 $, то есть $ a \ne 2 $.</p><p>Решим первое неравенство: $ \frac{4a-3}{2-a} + 1 \ge 0 $ $ \frac{4a-3+2-a}{2-a} \ge 0 $ $ \frac{3a-1}{2-a} \ge 0 $ Решением этого неравенства методом интервалов является промежуток $ a \in [\frac{1}{3}, 2) $.</p><p>Решим второе неравенство: $ \frac{4a-3}{2-a} - 1 \le 0 $ $ \frac{4a-3-(2-a)}{2-a} \le 0 $ $ \frac{5a-5}{2-a} \le 0 $ $ \frac{5(a-1)}{2-a} \le 0 $ Решением этого неравенства является объединение промежутков $ a \in (-\infty, 1] \cup (2, +\infty) $.</p><p>Найдем пересечение полученных решений: $ a \in [\frac{1}{3}, 2) \cap ((-\infty, 1] \cup (2, +\infty)) $. Пересечением является отрезок $ [\frac{1}{3}, 1] $.</p><p><strong>Ответ:</strong> $a \in [\frac{1}{3}, 1]$.</p><hr><p><strong>б)</strong> Значение выражения в правой части должно принадлежать области значений функции косинус, то есть отрезку $ [-1, 1] $. Знаменатель дроби не должен быть равен нулю.</p><p>Получаем систему неравенств: $ \begin{cases} \frac{3a+2}{3-a} \ge -1 \\ \frac{3a+2}{3-a} \le 1 \end{cases} $ и условие $ 3-a \ne 0 $, то есть $ a \ne 3 $.</p><p>Решим первое неравенство: $ \frac{3a+2}{3-a} + 1 \ge 0 $ $ \frac{3a+2+3-a}{3-a} \ge 0 $ $ \frac{2a+5}{3-a} \ge 0 $ Решением этого неравенства является промежуток $ a \in [-\frac{5}{2}, 3) $.</p><p>Решим второе неравенство: $ \frac{3a+2}{3-a} - 1 \le 0 $ $ \frac{3a+2-(3-a)}{3-a} \le 0 $ $ \frac{4a-1}{3-a} \le 0 $ Решением этого неравенства является объединение промежутков $ a \in (-\infty, \frac{1}{4}] \cup (3, +\infty) $.</p><p>Найдем пересечение полученных решений: $ a \in [-\frac{5}{2}, 3) \cap ((-\infty, \frac{1}{4}] \cup (3, +\infty)) $. Пересечением является отрезок $ [-\frac{5}{2}, \frac{1}{4}] $.</p><p><strong>Ответ:</strong> $a \in [-\frac{5}{2}, \frac{1}{4}]$.</p><hr><p><strong>в)</strong> Выражение в правой части должно принадлежать отрезку $ [-1, 1] $. Найдем область допустимых значений $ a $. Знаменатель не может быть равен нулю: $ a^2-1 \ne 0 \implies (a-1)(a+1) \ne 0 \implies a \ne 1 $ и $ a \ne -1 $.</p><p>Упростим выражение в правой части, разложив числитель и знаменатель на множители: $ \sin x = \frac{a^2-3a+2}{a^2-1} = \frac{(a-1)(a-2)}{(a-1)(a+1)} = \frac{a-2}{a+1} $ при $ a \ne 1 $.</p><p>Теперь решаем двойное неравенство для упрощенного выражения: $ -1 \le \frac{a-2}{a+1} \le 1 $. Система неравенств: $ \begin{cases} \frac{a-2}{a+1} \ge -1 \\ \frac{a-2}{a+1} \le 1 \end{cases} $ при условии $ a \ne -1 $ и $ a \ne 1 $.</p><p>Первое неравенство: $ \frac{a-2}{a+1} + 1 \ge 0 \implies \frac{a-2+a+1}{a+1} \ge 0 \implies \frac{2a-1}{a+1} \ge 0 $. Решение: $ a \in (-\infty, -1) \cup [\frac{1}{2}, +\infty) $.</p><p>Второе неравенство: $ \frac{a-2}{a+1} - 1 \le 0 \implies \frac{a-2-(a+1)}{a+1} \le 0 \implies \frac{-3}{a+1} \le 0 $. Это неравенство верно, когда $ a+1 > 0 $, то есть $ a > -1 $. Решение: $ a \in (-1, +\infty) $.</p><p>Пересечение решений $ a \in ((-\infty, -1) \cup [\frac{1}{2}, +\infty)) \cap (-1, +\infty) $ дает $ a \in [\frac{1}{2}, +\infty) $. Учитывая исходное ограничение $ a \ne 1 $, получаем окончательный ответ.</p><p><strong>Ответ:</strong> $a \in [\frac{1}{2}, 1) \cup (1, +\infty)$.</p><hr><p><strong>г)</strong> Выражение в правой части должно принадлежать отрезку $ [-1, 1] $. Найдем ОДЗ: $ a^2+a-2 \ne 0 $. Корнями уравнения $ a^2+a-2 = 0 $ являются $ a_1=1 $ и $ a_2=-2 $. Значит, $ a \ne 1 $ и $ a \ne -2 $.</p><p>Упростим выражение: $ \cos x = \frac{a^2-4}{a^2+a-2} = \frac{(a-2)(a+2)}{(a-1)(a+2)} = \frac{a-2}{a-1} $ при $ a \ne -2 $.</p><p>Решаем двойное неравенство: $ -1 \le \frac{a-2}{a-1} \le 1 $. Система неравенств: $ \begin{cases} \frac{a-2}{a-1} \ge -1 \\ \frac{a-2}{a-1} \le 1 \end{cases} $ при условии $ a \ne 1 $ и $ a \ne -2 $.</p><p>Первое неравенство: $ \frac{a-2}{a-1} + 1 \ge 0 \implies \frac{a-2+a-1}{a-1} \ge 0 \implies \frac{2a-3}{a-1} \ge 0 $. Решение: $ a \in (-\infty, 1) \cup [\frac{3}{2}, +\infty) $.</p><p>Второе неравенство: $ \frac{a-2}{a-1} - 1 \le 0 \implies \frac{a-2-(a-1)}{a-1} \le 0 \implies \frac{-1}{a-1} \le 0 $. Это неравенство верно, когда $ a-1 > 0 $, то есть $ a > 1 $. Решение: $ a \in (1, +\infty) $.</p><p>Пересечение решений $ a \in ((-\infty, 1) \cup [\frac{3}{2}, +\infty)) \cap (1, +\infty) $ дает $ a \in [\frac{3}{2}, +\infty) $. Этот промежуток удовлетворяет всем исходным ограничениям.</p><p><strong>Ответ:</strong> $a \in [\frac{3}{2}, +\infty)$.</p>" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "next" => array:2 [ "refs" => "1108357" "type" => "task" ] "previous" => array:2 [ "refs" => "1108355" "type" => "task" ] "book" => Illuminate\Database\Eloquent\Collection {#1223 #items: array:1 [ 0 => App\Models\Book {#1183 #connection: "mysql" #table: "books" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:50 [ "id" => 4298 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_tree_default_status" => "tasks" "field_pages_status" => null "field_subject" => Illuminate\Database\Eloquent\Collection {#1169 #items: array:1 [ 0 => App\Models\Term {#1168 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:10 [ "id" => 6471 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Алгебра" "field_abbreviated_name" => null "field_cases" => array:6 [ …6] "field_foreign_lang_name" => null "field_short_name" => null "field_subject_type" => "technical_subject" "field_translit" => "algebra" ] #original: array:10 [ "id" => 6471 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Алгебра" "field_abbreviated_name" => null "field_cases" => array:6 [ …6] "field_foreign_lang_name" => null "field_short_name" => null "field_subject_type" => "technical_subject" "field_translit" => "algebra" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_class" => Illuminate\Database\Eloquent\Collection {#1167 #items: array:1 [ 0 => App\Models\Term {#1174 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 5458 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "9" "field_cases" => array:6 [ …6] "field_translit" => "devjatyj" ] #original: array:6 [ "id" => 5458 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "9" "field_cases" => array:6 [ …6] "field_translit" => "devjatyj" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_publisher" => Illuminate\Database\Eloquent\Collection {#1173 #items: array:1 [ 0 => App\Models\Term {#1172 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 7002 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Кокшетау" "field_cases" => array:6 [ …6] "field_translit" => "Kokshetau" ] #original: array:6 [ "id" => 7002 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Кокшетау" "field_cases" => array:6 [ …6] "field_translit" => "Kokshetau" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_author" => Illuminate\Database\Eloquent\Collection {#1170 #items: array:3 [ 0 => App\Models\Term {#1171 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:12 [ "id" => 7003 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Солтан" "field_bio" => null "field_degree_rp" => null "field_foreign_lang_name" => null "field_foreign_lang_patronymic" => null "field_foreign_lang_surname" => null "field_name" => "Генадий" "field_patronymic" => "Николаевич" "field_surname_rp" => null ] #original: array:12 [ "id" => 7003 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Солтан" "field_bio" => null "field_degree_rp" => null "field_foreign_lang_name" => null "field_foreign_lang_patronymic" => null "field_foreign_lang_surname" => null "field_name" => "Генадий" "field_patronymic" => "Николаевич" "field_surname_rp" => null ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 1 => App\Models\Term {#1177 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:12 [ "id" => 7004 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Солтан" "field_bio" => null "field_degree_rp" => null "field_foreign_lang_name" => null "field_foreign_lang_patronymic" => null "field_foreign_lang_surname" => null "field_name" => "Алла" "field_patronymic" => "Евгеньевна" "field_surname_rp" => null ] #original: array:12 [ "id" => 7004 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Солтан" "field_bio" => null "field_degree_rp" => null "field_foreign_lang_name" => null "field_foreign_lang_patronymic" => null "field_foreign_lang_surname" => null "field_name" => "Алла" "field_patronymic" => "Евгеньевна" "field_surname_rp" => null ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 2 => App\Models\Term {#1175 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:12 [ "id" => 7005 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Жумадилова" "field_bio" => null "field_degree_rp" => null "field_foreign_lang_name" => null "field_foreign_lang_patronymic" => null "field_foreign_lang_surname" => null "field_name" => "Аманбала" "field_patronymic" => "Жумадиловна" "field_surname_rp" => null ] #original: array:12 [ "id" => 7005 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Жумадилова" "field_bio" => null "field_degree_rp" => null "field_foreign_lang_name" => null "field_foreign_lang_patronymic" => null "field_foreign_lang_surname" => null "field_name" => "Аманбала" "field_patronymic" => "Жумадиловна" "field_surname_rp" => null ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1182 #items: [] #escapeWhenCastingToString: false } "field_book_type" => Illuminate\Database\Eloquent\Collection {#1184 #items: array:1 [ 0 => App\Models\Term {#1180 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:10 [ "id" => 6671 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Учебник" "field_book_type_foreign" => null "field_cases" => array:6 [ …6] "field_plural_form" => null "field_short_name" => null "field_short_name_foreign" => null "field_translit" => "uchebnik" ] #original: array:10 [ "id" => 6671 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Учебник" "field_book_type_foreign" => null "field_cases" => array:6 [ …6] "field_plural_form" => null "field_short_name" => null "field_short_name_foreign" => null "field_translit" => "uchebnik" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_country" => Illuminate\Database\Eloquent\Collection {#1178 #items: array:1 [ 0 => App\Models\Term {#1181 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 6994 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Казахстан" "field_cases" => array:6 [ …6] "field_translit" => "kazakhstan" ] #original: array:6 [ "id" => 6994 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Казахстан" "field_cases" => array:6 [ …6] "field_translit" => "kazakhstan" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_city" => Illuminate\Database\Eloquent\Collection {#1179 #items: array:1 [ 0 => App\Models\Term {#1209 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 6995 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Алматы" "field_cases" => array:6 [ …6] "field_translit" => "almaty" ] #original: array:6 [ "id" => 6995 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Алматы" "field_cases" => array:6 [ …6] "field_translit" => "almaty" ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "field_series" => Illuminate\Database\Eloquent\Collection {#1210 #items: [] #escapeWhenCastingToString: false } "field_umk" => Illuminate\Database\Eloquent\Collection {#1212 #items: [] #escapeWhenCastingToString: false } "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1213 #items: [] #escapeWhenCastingToString: false } "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1214 #items: [] #escapeWhenCastingToString: false } "field_publication_number" => null "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1215 #items: [] #escapeWhenCastingToString: false } "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1216 #items: [] #escapeWhenCastingToString: false } "field_under_the_edition_degree" => null "field_cover_description" => null "field_publication_year" => "2019" "field_publication_year_until" => null "field_part" => "" "field_part_writing" => "" "field_second_foreign_language" => null "field_for_whom" => "Учебник для учащихся 9 класса общеобразовательных школ" "field_allowed" => "Рекомендовано Министерством образования и науки Республики Казахстан" "field_reserve_field" => null "field_link_to_source" => null "field_tasks_count" => "1291" "field_priority" => "4" "field_default_folder" => "/algebra_09/soltan-u19/" "field_isbn" => "978-601-317-424-2" "field_cover" => array:1 [ 0 => "/media/algebra_09/soltan-u19/covers/cover1.webp?ts=1752140452" ] "field_cover_alts" => array:1 [ 0 => "" ] "field_covers" => array:1 [ 0 => array:4 [ "path" => "/media/algebra_09/soltan-u19/covers/cover1.webp?ts=1752140452" "alt" => "" "width" => "1940" "height" => "2895" ] ] "field_popular_book" => null "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1217 #items: [] #escapeWhenCastingToString: false } "field_new_book" => Illuminate\Database\Eloquent\Collection {#1218 #items: [] #escapeWhenCastingToString: false } "field_old_book" => Illuminate\Database\Eloquent\Collection {#1219 #items: [] #escapeWhenCastingToString: false } "field_url" => "/9-klass/algebra/kokshetau-soltan-uchebnik" "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1220 #items: [] #escapeWhenCastingToString: false } "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "breadcrumbs" => array:3 [ "class" => 380 "subject" => 542 "class_subject" => 386 ] ] #original: array:50 [ "id" => 4298 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_tree_default_status" => "tasks" "field_pages_status" => null "field_subject" => Illuminate\Database\Eloquent\Collection {#1169} "field_class" => Illuminate\Database\Eloquent\Collection {#1167} "field_publisher" => Illuminate\Database\Eloquent\Collection {#1173} "field_author" => Illuminate\Database\Eloquent\Collection {#1170} "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1182} "field_book_type" => Illuminate\Database\Eloquent\Collection {#1184} "field_country" => Illuminate\Database\Eloquent\Collection {#1178} "field_city" => Illuminate\Database\Eloquent\Collection {#1179} "field_series" => Illuminate\Database\Eloquent\Collection {#1210} "field_umk" => Illuminate\Database\Eloquent\Collection {#1212} "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1213} "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1214} "field_publication_number" => null "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1215} "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1216} "field_under_the_edition_degree" => null "field_cover_description" => null "field_publication_year" => "2019" "field_publication_year_until" => null "field_part" => "" "field_part_writing" => "" "field_second_foreign_language" => null "field_for_whom" => "Учебник для учащихся 9 класса общеобразовательных школ" "field_allowed" => "Рекомендовано Министерством образования и науки Республики Казахстан" "field_reserve_field" => null "field_link_to_source" => null "field_tasks_count" => "1291" "field_priority" => "4" "field_default_folder" => "/algebra_09/soltan-u19/" "field_isbn" => "978-601-317-424-2" "field_cover" => array:1 [ 0 => "/media/algebra_09/soltan-u19/covers/cover1.webp?ts=1752140452" ] "field_cover_alts" => array:1 [ 0 => "" ] "field_covers" => array:1 [ 0 => array:4 [ "path" => "/media/algebra_09/soltan-u19/covers/cover1.webp?ts=1752140452" "alt" => "" "width" => "1940" "height" => "2895" ] ] "field_popular_book" => null "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1217} "field_new_book" => Illuminate\Database\Eloquent\Collection {#1218} "field_old_book" => Illuminate\Database\Eloquent\Collection {#1219} "field_url" => "/9-klass/algebra/kokshetau-soltan-uchebnik" "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1220} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "breadcrumbs" => array:3 [ "class" => 380 "subject" => 542 "class_subject" => 386 ] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "page" => Illuminate\Database\Eloquent\Collection {#1228 #items: array:1 [ 0 => App\Models\BookPage {#1227 #connection: "mysql" #table: "book_pages" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:21 [ "id" => 1097923 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "181" "field_url" => "/9-klass/algebra/kokshetau-soltan-uchebnik/page-181" "field_display_title" => "181" "field_folder" => "folder1" "field_image_name" => "181" "field_branch_parent" => Illuminate\Database\Eloquent\Collection {#1229 #items: [] #escapeWhenCastingToString: false } "field_weight" => "0" "field_book_parent" => Illuminate\Database\Eloquent\Collection {#1230 #items: array:1 [ 0 => App\Models\Book {#1183} ] #escapeWhenCastingToString: false } "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "edition_groups" => Illuminate\Database\Eloquent\Collection {#1231 #items: [] #escapeWhenCastingToString: false } "content" => Illuminate\Database\Eloquent\Collection {#1241 #items: array:1 [ 0 => App\Models\Element {#1240 #connection: "mysql" #table: "elements" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:6 [ "id" => 1261074 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1242 …2} "book_page" => array:2 [ …2] "img" => array:1 [ …1] ] #original: array:6 [ "id" => 1261074 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1242 …2} "book_page" => array:2 [ …2] "img" => array:1 [ …1] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } ] #escapeWhenCastingToString: false } "next" => array:2 [ "refs" => "1097924" "type" => "book_page" ] "previous" => array:2 [ "refs" => "1097922" "type" => "book_page" ] "tasks" => Illuminate\Database\Eloquent\Collection {#1425 #items: array:7 [ 0 => App\Models\Task {#1439 #connection: "mysql" #table: "tasks" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 1108354 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "181" "field_page_end" => null "field_url" => "/9-klass/algebra/kokshetau-soltan-uchebnik/1-619" "field_display_title" => "619" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1440 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1441 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1442 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1443 …2} "content" => Illuminate\Database\Eloquent\Collection {#1446 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1452 …2} "page" => array:2 [ …2] ] #original: array:24 [ "id" => 1108354 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "181" "field_page_end" => null "field_url" => "/9-klass/algebra/kokshetau-soltan-uchebnik/1-619" "field_display_title" => "619" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1440 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1441 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1442 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1443 …2} "content" => Illuminate\Database\Eloquent\Collection {#1446 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1452 …2} "page" => array:2 [ …2] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 1 => App\Models\Task {#1445 #connection: "mysql" #table: "tasks" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 1108355 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "181" "field_page_end" => null "field_url" => "/9-klass/algebra/kokshetau-soltan-uchebnik/1-620" "field_display_title" => "620" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1444 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1451 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1453 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1449 …2} "content" => Illuminate\Database\Eloquent\Collection {#1467 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1474 …2} "page" => array:2 [ …2] ] #original: array:24 [ "id" => 1108355 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "181" "field_page_end" => null "field_url" => "/9-klass/algebra/kokshetau-soltan-uchebnik/1-620" "field_display_title" => "620" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1444 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1451 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1453 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1449 …2} "content" => Illuminate\Database\Eloquent\Collection {#1467 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1474 …2} "page" => array:2 [ …2] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 2 => App\Models\Task {#1447 #connection: "mysql" #table: "tasks" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 1108356 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "181" "field_page_end" => null "field_url" => "/9-klass/algebra/kokshetau-soltan-uchebnik/1-621" "field_display_title" => "621" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1448 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1450 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1465 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1464 …2} "content" => Illuminate\Database\Eloquent\Collection {#1463 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1461 …2} "page" => array:2 [ …2] ] #original: array:24 [ "id" => 1108356 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "181" "field_page_end" => null "field_url" => "/9-klass/algebra/kokshetau-soltan-uchebnik/1-621" "field_display_title" => "621" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1448 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1450 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1465 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1464 …2} "content" => Illuminate\Database\Eloquent\Collection {#1463 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1461 …2} "page" => array:2 [ …2] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 3 => App\Models\Task {#1462 #connection: "mysql" #table: "tasks" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 1108357 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "181" "field_page_end" => null "field_url" => "/9-klass/algebra/kokshetau-soltan-uchebnik/1-622" "field_display_title" => "622" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1468 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1466 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1473 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1475 …2} "content" => Illuminate\Database\Eloquent\Collection {#1472 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1487 …2} "page" => array:2 [ …2] ] #original: array:24 [ "id" => 1108357 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "181" "field_page_end" => null "field_url" => "/9-klass/algebra/kokshetau-soltan-uchebnik/1-622" "field_display_title" => "622" "field_outside_task" => null "field_task_type" => Illuminate\Database\Eloquent\Collection {#1468 …2} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => null "field_match" => null "breadcrumbs" => [] "edition_groups" => Illuminate\Database\Eloquent\Collection {#1466 …2} "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1473 …2} "parent_branches" => Illuminate\Database\Eloquent\Collection {#1475 …2} "content" => Illuminate\Database\Eloquent\Collection {#1472 …2} "next" => array:2 [ …2] "previous" => array:2 [ …2] "book" => Illuminate\Database\Eloquent\Collection {#1487 …2} "page" => array:2 [ …2] ] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] } 4 => App\Models\Task {#1469 #connection: "mysql" #table: "tasks" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:24 [ "id" => 1108358 "created_at" => 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№621 (с. 181)
Условие. №621 (с. 181)
скриншот условия
621. Установите, каким должно быть число a, чтобы выполнялось равенство:
a) $ \sin x = \frac{4a - 3}{2 - a} $;
б) $ \cos x = \frac{3a + 2}{3 - a} $;
в) $ \sin x = \frac{a^2 - 3a + 2}{a^2 - 1} $;
г) $ \cos x = \frac{a^2 - 4}{a^2 + a - 2} $;
Решение. №621 (с. 181)
Решение 2 (rus). №621 (с. 181)
а) Чтобы равенство выполнялось, значение выражения в правой части должно принадлежать области значений функции синус, то есть отрезку $ [-1, 1] $. Кроме того, знаменатель дроби не должен быть равен нулю.
Получаем систему неравенств: $ \begin{cases} \frac{4a-3}{2-a} \ge -1 \\ \frac{4a-3}{2-a} \le 1 \end{cases} $ и условие $ 2-a \ne 0 $, то есть $ a \ne 2 $.
Решим первое неравенство: $ \frac{4a-3}{2-a} + 1 \ge 0 $ $ \frac{4a-3+2-a}{2-a} \ge 0 $ $ \frac{3a-1}{2-a} \ge 0 $ Решением этого неравенства методом интервалов является промежуток $ a \in [\frac{1}{3}, 2) $.
Решим второе неравенство: $ \frac{4a-3}{2-a} - 1 \le 0 $ $ \frac{4a-3-(2-a)}{2-a} \le 0 $ $ \frac{5a-5}{2-a} \le 0 $ $ \frac{5(a-1)}{2-a} \le 0 $ Решением этого неравенства является объединение промежутков $ a \in (-\infty, 1] \cup (2, +\infty) $.
Найдем пересечение полученных решений: $ a \in [\frac{1}{3}, 2) \cap ((-\infty, 1] \cup (2, +\infty)) $. Пересечением является отрезок $ [\frac{1}{3}, 1] $.
Ответ: $a \in [\frac{1}{3}, 1]$.
б) Значение выражения в правой части должно принадлежать области значений функции косинус, то есть отрезку $ [-1, 1] $. Знаменатель дроби не должен быть равен нулю.
Получаем систему неравенств: $ \begin{cases} \frac{3a+2}{3-a} \ge -1 \\ \frac{3a+2}{3-a} \le 1 \end{cases} $ и условие $ 3-a \ne 0 $, то есть $ a \ne 3 $.
Решим первое неравенство: $ \frac{3a+2}{3-a} + 1 \ge 0 $ $ \frac{3a+2+3-a}{3-a} \ge 0 $ $ \frac{2a+5}{3-a} \ge 0 $ Решением этого неравенства является промежуток $ a \in [-\frac{5}{2}, 3) $.
Решим второе неравенство: $ \frac{3a+2}{3-a} - 1 \le 0 $ $ \frac{3a+2-(3-a)}{3-a} \le 0 $ $ \frac{4a-1}{3-a} \le 0 $ Решением этого неравенства является объединение промежутков $ a \in (-\infty, \frac{1}{4}] \cup (3, +\infty) $.
Найдем пересечение полученных решений: $ a \in [-\frac{5}{2}, 3) \cap ((-\infty, \frac{1}{4}] \cup (3, +\infty)) $. Пересечением является отрезок $ [-\frac{5}{2}, \frac{1}{4}] $.
Ответ: $a \in [-\frac{5}{2}, \frac{1}{4}]$.
в) Выражение в правой части должно принадлежать отрезку $ [-1, 1] $. Найдем область допустимых значений $ a $. Знаменатель не может быть равен нулю: $ a^2-1 \ne 0 \implies (a-1)(a+1) \ne 0 \implies a \ne 1 $ и $ a \ne -1 $.
Упростим выражение в правой части, разложив числитель и знаменатель на множители: $ \sin x = \frac{a^2-3a+2}{a^2-1} = \frac{(a-1)(a-2)}{(a-1)(a+1)} = \frac{a-2}{a+1} $ при $ a \ne 1 $.
Теперь решаем двойное неравенство для упрощенного выражения: $ -1 \le \frac{a-2}{a+1} \le 1 $. Система неравенств: $ \begin{cases} \frac{a-2}{a+1} \ge -1 \\ \frac{a-2}{a+1} \le 1 \end{cases} $ при условии $ a \ne -1 $ и $ a \ne 1 $.
Первое неравенство: $ \frac{a-2}{a+1} + 1 \ge 0 \implies \frac{a-2+a+1}{a+1} \ge 0 \implies \frac{2a-1}{a+1} \ge 0 $. Решение: $ a \in (-\infty, -1) \cup [\frac{1}{2}, +\infty) $.
Второе неравенство: $ \frac{a-2}{a+1} - 1 \le 0 \implies \frac{a-2-(a+1)}{a+1} \le 0 \implies \frac{-3}{a+1} \le 0 $. Это неравенство верно, когда $ a+1 > 0 $, то есть $ a > -1 $. Решение: $ a \in (-1, +\infty) $.
Пересечение решений $ a \in ((-\infty, -1) \cup [\frac{1}{2}, +\infty)) \cap (-1, +\infty) $ дает $ a \in [\frac{1}{2}, +\infty) $. Учитывая исходное ограничение $ a \ne 1 $, получаем окончательный ответ.
Ответ: $a \in [\frac{1}{2}, 1) \cup (1, +\infty)$.
г) Выражение в правой части должно принадлежать отрезку $ [-1, 1] $. Найдем ОДЗ: $ a^2+a-2 \ne 0 $. Корнями уравнения $ a^2+a-2 = 0 $ являются $ a_1=1 $ и $ a_2=-2 $. Значит, $ a \ne 1 $ и $ a \ne -2 $.
Упростим выражение: $ \cos x = \frac{a^2-4}{a^2+a-2} = \frac{(a-2)(a+2)}{(a-1)(a+2)} = \frac{a-2}{a-1} $ при $ a \ne -2 $.
Решаем двойное неравенство: $ -1 \le \frac{a-2}{a-1} \le 1 $. Система неравенств: $ \begin{cases} \frac{a-2}{a-1} \ge -1 \\ \frac{a-2}{a-1} \le 1 \end{cases} $ при условии $ a \ne 1 $ и $ a \ne -2 $.
Первое неравенство: $ \frac{a-2}{a-1} + 1 \ge 0 \implies \frac{a-2+a-1}{a-1} \ge 0 \implies \frac{2a-3}{a-1} \ge 0 $. Решение: $ a \in (-\infty, 1) \cup [\frac{3}{2}, +\infty) $.
Второе неравенство: $ \frac{a-2}{a-1} - 1 \le 0 \implies \frac{a-2-(a-1)}{a-1} \le 0 \implies \frac{-1}{a-1} \le 0 $. Это неравенство верно, когда $ a-1 > 0 $, то есть $ a > 1 $. Решение: $ a \in (1, +\infty) $.
Пересечение решений $ a \in ((-\infty, 1) \cup [\frac{3}{2}, +\infty)) \cap (1, +\infty) $ дает $ a \in [\frac{3}{2}, +\infty) $. Этот промежуток удовлетворяет всем исходным ограничениям.
Ответ: $a \in [\frac{3}{2}, +\infty)$.
Другие задания:
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