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Номер 451, страница 132 - гдз по алгебре 8 класс учебник Дорофеев, Суворова
Авторы: Дорофеев Г. В., Суворова С. Б., Бунимович Е. А., Кузнецова Л. В., Минаева С. С., Рослова Л. О.
Тип: Учебник
Издательство: Просвещение
Год издания: 2019 - 2022
Цвет обложки: белый, бирюзовый, оранжевый
Допущено Министерством просвещения Российской Федерации
Популярные ГДЗ в 8 классе
Глава 3. Квадратные уравнения. 3.3. Вторая формула корней квадратного уравнения. Упражнения - номер 451, страница 132.
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" => 209561 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_page_start" => "132" "field_page_end" => null "field_url" => "/8-klass/algebra/dorofeev-uchebnik/451" "field_display_title" => "451" "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 {#1046 #items: array:1 [ 0 => App\Models\Branch {#1045 #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" => 208919 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_display_title" => "Квадратные уравнения" "field_branch_order" => "3" "field_url" => null "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1050 #items: array:1 [ 0 => App\Models\Term {#1047 #connection: "mysql" #table: "terms" #primaryKey: "id" #keyType: "int" +incrementing: false #with: [] #withCount: [] +preventsLazyLoading: false #perPage: 15 +exists: true +wasRecentlyCreated: false #escapeWhenCastingToString: false #attributes: array:7 [ "id" => 29 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Глава" "field_cases" => array:6 [ …6] "field_page_check_not_needed" => null "field_short_name" => null ] #original: array:7 [ "id" => 29 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Глава" "field_cases" => array:6 [ …6] "field_page_check_not_needed" => null "field_short_name" => 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_page_start" => "120" "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 {#1087 #items: array:1 [ 0 => App\Models\Book {#1049 #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" => 80 "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 {#1051 #items: array:1 [ 0 => App\Models\Term {#1048 #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 {#1052 #items: array:1 [ 0 => App\Models\Term {#1053 #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" => 5457 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "8" "field_cases" => array:6 [ …6] "field_translit" => "vosmoj" ] #original: array:6 [ "id" => 5457 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "8" "field_cases" => array:6 [ …6] "field_translit" => "vosmoj" ] #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 {#1054 #items: array:1 [ 0 => App\Models\Term {#1055 #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" => 5153 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Просвещение" "field_cases" => null "field_translit" => "prosveschenie" ] #original: array:6 [ "id" => 5153 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Просвещение" "field_cases" => null "field_translit" => "prosveschenie" ] #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 {#1056 #items: array:6 [ 0 => App\Models\Term {#1057 #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" => 4283 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "name" => "Дорофеев" "field_bio" => null "field_degree_rp" => null "field_foreign_lang_name" => null …5 ] #original: array:12 [ …12] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ …1] } 1 => App\Models\Term {#1058 #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 [ …12] #original: array:12 [ …12] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ …1] } 2 => App\Models\Term {#1059 #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 [ …12] #original: array:12 [ …12] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ …1] } 3 => App\Models\Term {#1060 #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 [ …12] #original: array:12 [ …12] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ …1] } 4 => App\Models\Term {#1061 #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 [ …12] #original: array:12 [ …12] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ …1] } 5 => App\Models\Term {#1062 #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 [ …12] #original: array:12 [ …12] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ …1] } ] #escapeWhenCastingToString: false } "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1063 #items: [] #escapeWhenCastingToString: false } "field_book_type" => Illuminate\Database\Eloquent\Collection {#1064 #items: array:1 [ 0 => App\Models\Term {#1065 #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 [ …10] #original: array:10 [ …10] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ …1] } ] #escapeWhenCastingToString: false } "field_country" => Illuminate\Database\Eloquent\Collection {#1066 #items: array:1 [ 0 => App\Models\Term {#1067 #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 [ …6] #original: array:6 [ …6] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ …1] } ] #escapeWhenCastingToString: false } "field_city" => Illuminate\Database\Eloquent\Collection {#1068 #items: array:1 [ 0 => App\Models\Term {#1069 #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 [ …6] #original: array:6 [ …6] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ …1] } ] #escapeWhenCastingToString: false } "field_series" => Illuminate\Database\Eloquent\Collection {#1070 #items: [] #escapeWhenCastingToString: false } "field_umk" => Illuminate\Database\Eloquent\Collection {#1071 #items: [] #escapeWhenCastingToString: false } "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1072 #items: [] #escapeWhenCastingToString: false } "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1073 #items: array:1 [ 0 => App\Models\Term {#1074 #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 [ …10] #original: array:10 [ …10] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ …1] } ] #escapeWhenCastingToString: false } "field_publication_number" => "7" "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1075 #items: array:1 [ 0 => App\Models\Term {#1076 #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 [ …6] #original: array:6 [ …6] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ …1] } ] #escapeWhenCastingToString: false } "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1077 #items: [] #escapeWhenCastingToString: false } "field_under_the_edition_degree" => null "field_cover_description" => null "field_publication_year" => "2019" "field_publication_year_until" => "2022" "field_part" => "" "field_part_writing" => "" "field_second_foreign_language" => null "field_for_whom" => "Учебник для общеобразовательных организаций" "field_allowed" => "Допущено Министерством просвещения Российской Федерации" "field_reserve_field" => null "field_link_to_source" => null "field_tasks_count" => "1206" "field_priority" => "14" "field_default_folder" => "/algebra_08/dorofeev/" "field_isbn" => null "field_cover" => array:1 [ 0 => "/media/algebra_08/dorofeev/covers/cover1.webp?ts=1734213765" ] "field_cover_alts" => array:1 [ 0 => "" ] "field_covers" => array:1 [ 0 => array:4 [ "path" => "/media/algebra_08/dorofeev/covers/cover1.webp?ts=1734213765" "alt" => "" "width" => "1919" "height" => "2577" ] ] "field_popular_book" => null "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1078 #items: [] #escapeWhenCastingToString: false } "field_new_book" => Illuminate\Database\Eloquent\Collection {#1079 #items: [] #escapeWhenCastingToString: false } "field_old_book" => Illuminate\Database\Eloquent\Collection {#1080 #items: [] #escapeWhenCastingToString: false } "field_url" => "/8-klass/algebra/dorofeev-uchebnik" "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1081 #items: array:3 [ 0 => App\Models\Term {#1082 #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 [ …6] #original: array:6 [ …6] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ …1] } 1 => App\Models\Term {#1083 #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 [ …6] #original: array:6 [ …6] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ …1] } 2 => App\Models\Term {#1084 #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 [ …6] #original: array:6 [ …6] #changes: [] #casts: [] #classCastCache: [] #attributeCastCache: [] #dateFormat: null #appends: [] #dispatchesEvents: [] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ …1] } ] #escapeWhenCastingToString: false } "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => "<!--Текст в низу страницы--> <h2> Почему ученикам нужен решебник? </h2> <p> Многое из того, что изучается в школе, в дальнейшем не пригодится. Так, по крайней мере думают подростки. Однако на практике все получается совершенно по-другому. Поэтому как бы сложен не был предмет (например, алгебра), его необходимо как следует изучить. Чтобы процесс восприятия материала проходил легко и без заминок, следует использовать «<strong>ГДЗ по Алгебре 8 класс Учебник Дорофеев, Суворова, Бунимович, Кузнецова, Минаева, Рослова (Просвещение)</strong>». </p> <p> В справочнике нашли отражение следующие темы: <ol> <li>Алгебраическая дробь, ее свойства, действия с ней.</li> <li>Как преобразовать степень?</li> <li>Теорема Пифагора.</li> <li>График зависимости y=√х.</li> <li>Квадратный и кубический корни.</li> <li>Двойные радикалы, и т.д.</li> </ol> <p> В восьмом классе по предмету проходят спаренные уроки, что с одной стороны должно помочь учителю более подробно объяснить каждую тему. Но на деле и этого времени все равно не хватает, так как программа стала еще обширнее. В итоге, как и раньше, ребятам придется многое разбирать самостоятельно и закреплять полученные в классе навыки практическим путем, но уже дома. Такая задача весьма сложна не только для сильно отстающих учеников, но и для отличников, так что дополнительная помощь никогда не помешает. В этом случае на выручку всегда может прийти решебник. </p> <h2> Делать д/з лучше с ГДЗ к учебнику Дорофеева </h2> <p> Количество домашних заданий в этом году значительно возрастает, так что порой ребята проводят над тетрадями не один час. Но даже это не гарантирует, что все упражнения будут сделаны правильно. Поэтому необходимо сразу же проверять написанное, чтобы не схлопотать плохую оценку. Так как самостоятельно подростки такого мониторинга не проводят, то им поможет в этом <strong>сборник ответов по алгебре 8 класс к учебнику Дорофеева</strong>. </p> <p> Благодаря изданию учащиеся смогут: <ol> <li>улучшить качество письменных работ;</li> <li>избавиться от любых недочетов;</li> <li>приобрести хорошую успеваемость;</li> <li>устранять трудности по мере их возникновения.</li> </ol> <p> Систематически занимаясь с решебником, восьмиклассники научатся не только разбираться в самых непростых темах, но и будут активно применять свои навыки на практике. Это позволит им выбиться в отличники и успешно справляться со всеми поставленными учителем задачами. Кроме того, они могут не переживать о результатах многочисленных проверочных работ, так как будут знать весь материал «на зубок». </p> <h2> Как часто можно использовать онлайн-справочник? </h2> <p> В скором времени учащимся предстоит сдавать первые экзамены, после чего многие из них навсегда покинут школьные стены. Из-за этого на первое место встают успеваемость и качество полученных знаний. Родители стараются всячески помочь детям преодолеть все трудности и нередко записывают их к репетитору. Но намного действеннее могут оказаться занятия с <strong>гдз по алгебре за 8 класс Учебник Дорофеев</strong>. </p> <p> Сборник позволит ученикам: <ul> <li>самостоятельно разобрать все проблемные моменты;</li> <li>дополнительно потренироваться перед контрольными;</li> <li>работать в удобном для себя темпе;</li> <li>не зависеть от помощи взрослых.</li> </ul> <p> Опытные методисты, которые составили решебник, предоставили много полезной информации, благодаря чему никакие дополнительные действия для освоения дисциплины не понадобятся. Но, конечно, если подростки хотят добиться хороших результатов, им стоит забыть о списывании. Необходимо тщательно изучать все сведения, проводить анализ задач и уравнений, чтобы понять принцип их выполнения. Освоив это, восьмиклассники не будут испытывать затруднений при переходе к более сложному материалу. </p>" "breadcrumbs" => array:3 [ "class" => 379 "subject" => 542 "class_subject" => 385 ] ] #original: array:50 [ "id" => 80 "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 {#1051} "field_class" => Illuminate\Database\Eloquent\Collection {#1052} "field_publisher" => Illuminate\Database\Eloquent\Collection {#1054} "field_author" => Illuminate\Database\Eloquent\Collection {#1056} "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1063} "field_book_type" => Illuminate\Database\Eloquent\Collection {#1064} "field_country" => Illuminate\Database\Eloquent\Collection {#1066} "field_city" => Illuminate\Database\Eloquent\Collection {#1068} "field_series" => Illuminate\Database\Eloquent\Collection {#1070} "field_umk" => Illuminate\Database\Eloquent\Collection {#1071} "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1072} "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1073} "field_publication_number" => "7" "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1075} "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1077} "field_under_the_edition_degree" => null "field_cover_description" => null "field_publication_year" => "2019" "field_publication_year_until" => "2022" "field_part" => "" "field_part_writing" => "" "field_second_foreign_language" => null "field_for_whom" => "Учебник для общеобразовательных организаций" "field_allowed" => "Допущено Министерством просвещения Российской Федерации" "field_reserve_field" => null "field_link_to_source" => null "field_tasks_count" => "1206" "field_priority" => "14" "field_default_folder" => "/algebra_08/dorofeev/" "field_isbn" => null "field_cover" => array:1 [ 0 => "/media/algebra_08/dorofeev/covers/cover1.webp?ts=1734213765" ] "field_cover_alts" => array:1 [ 0 => "" ] "field_covers" => array:1 [ 0 => array:4 [ "path" => "/media/algebra_08/dorofeev/covers/cover1.webp?ts=1734213765" "alt" => "" "width" => "1919" "height" => "2577" ] ] "field_popular_book" => null "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1078} "field_new_book" => Illuminate\Database\Eloquent\Collection {#1079} "field_old_book" => Illuminate\Database\Eloquent\Collection {#1080} "field_url" => "/8-klass/algebra/dorofeev-uchebnik" "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1081} "field_metatags_title" => null "field_metatags_description" => null "field_h1" => null "field_description_top" => null "field_description_bottom" => "<!--Текст в низу страницы--> <h2> Почему ученикам нужен решебник? </h2> <p> Многое из того, что изучается в школе, в дальнейшем не пригодится. Так, по крайней мере думают подростки. Однако на практике все получается совершенно по-другому. Поэтому как бы сложен не был предмет (например, алгебра), его необходимо как следует изучить. Чтобы процесс восприятия материала проходил легко и без заминок, следует использовать «<strong>ГДЗ по Алгебре 8 класс Учебник Дорофеев, Суворова, Бунимович, Кузнецова, Минаева, Рослова (Просвещение)</strong>». </p> <p> В справочнике нашли отражение следующие темы: <ol> <li>Алгебраическая дробь, ее свойства, действия с ней.</li> <li>Как преобразовать степень?</li> <li>Теорема Пифагора.</li> <li>График зависимости y=√х.</li> <li>Квадратный и кубический корни.</li> <li>Двойные радикалы, и т.д.</li> </ol> <p> В восьмом классе по предмету проходят спаренные уроки, что с одной стороны должно помочь учителю более подробно объяснить каждую тему. Но на деле и этого времени все равно не хватает, так как программа стала еще обширнее. В итоге, как и раньше, ребятам придется многое разбирать самостоятельно и закреплять полученные в классе навыки практическим путем, но уже дома. Такая задача весьма сложна не только для сильно отстающих учеников, но и для отличников, так что дополнительная помощь никогда не помешает. В этом случае на выручку всегда может прийти решебник. </p> <h2> Делать д/з лучше с ГДЗ к учебнику Дорофеева </h2> <p> Количество домашних заданий в этом году значительно возрастает, так что порой ребята проводят над тетрадями не один час. Но даже это не гарантирует, что все упражнения будут сделаны правильно. Поэтому необходимо сразу же проверять написанное, чтобы не схлопотать плохую оценку. Так как самостоятельно подростки такого мониторинга не проводят, то им поможет в этом <strong>сборник ответов по алгебре 8 класс к учебнику Дорофеева</strong>. </p> <p> Благодаря изданию учащиеся смогут: <ol> <li>улучшить качество письменных работ;</li> <li>избавиться от любых недочетов;</li> <li>приобрести хорошую успеваемость;</li> <li>устранять трудности по мере их возникновения.</li> </ol> <p> Систематически занимаясь с решебником, восьмиклассники научатся не только разбираться в самых непростых темах, но и будут активно применять свои навыки на практике. Это позволит им выбиться в отличники и успешно справляться со всеми поставленными учителем задачами. Кроме того, они могут не переживать о результатах многочисленных проверочных работ, так как будут знать весь материал «на зубок». </p> <h2> Как часто можно использовать онлайн-справочник? </h2> <p> В скором времени учащимся предстоит сдавать первые экзамены, после чего многие из них навсегда покинут школьные стены. Из-за этого на первое место встают успеваемость и качество полученных знаний. Родители стараются всячески помочь детям преодолеть все трудности и нередко записывают их к репетитору. Но намного действеннее могут оказаться занятия с <strong>гдз по алгебре за 8 класс Учебник Дорофеев</strong>. </p> <p> Сборник позволит ученикам: <ul> <li>самостоятельно разобрать все проблемные моменты;</li> <li>дополнительно потренироваться перед контрольными;</li> <li>работать в удобном для себя темпе;</li> <li>не зависеть от помощи взрослых.</li> </ul> <p> Опытные методисты, которые составили решебник, предоставили много полезной информации, благодаря чему никакие дополнительные действия для освоения дисциплины не понадобятся. Но, конечно, если подростки хотят добиться хороших результатов, им стоит забыть о списывании. Необходимо тщательно изучать все сведения, проводить анализ задач и уравнений, чтобы понять принцип их выполнения. 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Вторая формула корней квадратного уравнения" "field_branch_order" => null "field_url" => null "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1152 …2} "field_page_start" => "130" "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 {#1153 …2} "branch_parent" => Illuminate\Database\Eloquent\Collection {#1154 …2} ] #original: array:24 [ "id" => 208926 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_display_title" => "3.3. Вторая формула корней квадратного уравнения" "field_branch_order" => null "field_url" => null "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1152 …2} "field_page_start" => "130" "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 {#1153 …2} "branch_parent" => Illuminate\Database\Eloquent\Collection {#1154 …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" => 208928 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "field_display_title" => "Упражнения" "field_branch_order" => null "field_url" => null "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1141} "field_page_start" => "132" "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 {#1142} "branch_parent" => Illuminate\Database\Eloquent\Collection {#1151} ] #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 {#1039 #items: array:5 [ 0 => App\Models\Element {#1129 #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" => 233362 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1120 #items: array:1 [ 0 => App\Models\Edition {#1038 #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" => 729 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Условие" "field_order" => "1" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1042 …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" => "tolik" "field_edition_type" => "statement" "field_root_dir" => "0-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1116 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1119 …2} "field_process_formula" => "katex" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1118 …2} "field_content_source" => null ] #original: array:21 [ "id" => 729 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Условие" "field_order" => "1" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1042 …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" => "tolik" "field_edition_type" => "statement" "field_root_dir" => "0-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1116 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1119 …2} "field_process_formula" => "katex" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1118 …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" => "209561" "type" => "task" ] "text" => "<p><strong>451 a)</strong> $0,3x^2 + 1,6x - 1,2 = 0;$</p><p><strong>б)</strong> $x^2 - \frac{2}{3}x = \frac{8}{3};$</p><p><strong>В)</strong> $\frac{z^2+z}{2}=15;$</p><p><strong>Г)</strong> $x^2+1=\frac{5x}{2};$</p><p><strong>Д)</strong> $0,1y^2 - 0,9y + 0,8 = 0;$</p><p><strong>е)</strong> $\frac{7}{20} - \frac{1}{5}x = x^2;$</p><p><strong>Ж)</strong> $5x^2 = \frac{1-5x}{10};$</p><p><strong>З)</strong> $\frac{1}{3}x^2 + \frac{3}{2}x = 3.$</p>" "img" => array:1 [ 0 => array:5 [ "name" => "451-1.jpg" "alt" => null "width" => "1453" "height" => 425 "path" => "/media/algebra_08/dorofeev/0-00/451-1.webp?ts=1734264415" ] ] ] #original: array:7 [ "id" => 233362 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1120} "task" => array:2 [ "refs" => "209561" "type" => "task" ] "text" => "<p><strong>451 a)</strong> $0,3x^2 + 1,6x - 1,2 = 0;$</p><p><strong>б)</strong> $x^2 - \frac{2}{3}x = \frac{8}{3};$</p><p><strong>В)</strong> $\frac{z^2+z}{2}=15;$</p><p><strong>Г)</strong> $x^2+1=\frac{5x}{2};$</p><p><strong>Д)</strong> $0,1y^2 - 0,9y + 0,8 = 0;$</p><p><strong>е)</strong> $\frac{7}{20} - \frac{1}{5}x = x^2;$</p><p><strong>Ж)</strong> $5x^2 = \frac{1-5x}{10};$</p><p><strong>З)</strong> $\frac{1}{3}x^2 + \frac{3}{2}x = 3.$</p>" "img" => array:1 [ 0 => array:5 [ "name" => "451-1.jpg" "alt" => null "width" => "1453" "height" => 425 "path" => "/media/algebra_08/dorofeev/0-00/451-1.webp?ts=1734264415" ] ] ] #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 {#1117 #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" => 236671 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1115 #items: array:1 [ 0 => App\Models\Edition {#1114 #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" => 730 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Решение 1" "field_order" => "2" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1113 …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" => "tolik" "field_edition_type" => "solution" "field_root_dir" => "1-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1110 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1111 …2} "field_process_formula" => "" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1108 …2} "field_content_source" => null ] #original: array:21 [ "id" => 730 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Решение 1" "field_order" => "2" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1113 …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" => "tolik" "field_edition_type" => "solution" "field_root_dir" => "1-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1110 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1111 …2} "field_process_formula" => "" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1108 …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" => "209561" "type" => "task" ] "img" => array:8 [ 0 => array:5 [ "name" => "451-1.png" "alt" => null "width" => "705" "height" => 1358 "path" => "/media/algebra_08/dorofeev/1-00/451-1.webp?ts=1734265795" ] 1 => array:5 [ "name" => "451-2.png" "alt" => null "width" => "705" "height" => 1551 "path" => "/media/algebra_08/dorofeev/1-00/451-2.webp?ts=1734265795" ] 2 => array:5 [ "name" => "451-3.png" "alt" => null "width" => "705" "height" => 1326 "path" => "/media/algebra_08/dorofeev/1-00/451-3.webp?ts=1734265795" ] 3 => array:5 [ "name" => "451-4.png" "alt" => null "width" => "705" "height" => 1375 "path" => "/media/algebra_08/dorofeev/1-00/451-4.webp?ts=1734265795" ] 4 => array:5 [ "name" => "451-5.png" "alt" => null "width" => "705" "height" => 1247 "path" => "/media/algebra_08/dorofeev/1-00/451-5.webp?ts=1734265795" ] 5 => array:5 [ "name" => "451-6.png" "alt" => null "width" => "705" "height" => 1543 "path" => "/media/algebra_08/dorofeev/1-00/451-6.webp?ts=1734265795" ] 6 => array:5 [ "name" => "451-7.png" "alt" => null "width" => "705" "height" => 1367 "path" => "/media/algebra_08/dorofeev/1-00/451-7.webp?ts=1734265795" ] 7 => array:5 [ "name" => "451-8.png" "alt" => null "width" => "705" "height" => 1440 "path" => "/media/algebra_08/dorofeev/1-00/451-8.webp?ts=1734265795" ] ] ] #original: array:6 [ "id" => 236671 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1115} "task" => array:2 [ "refs" => "209561" "type" => "task" ] "img" => array:8 [ 0 => array:5 [ "name" => "451-1.png" "alt" => null "width" => "705" "height" => 1358 "path" => "/media/algebra_08/dorofeev/1-00/451-1.webp?ts=1734265795" ] 1 => array:5 [ "name" => "451-2.png" "alt" => null "width" => "705" "height" => 1551 "path" => "/media/algebra_08/dorofeev/1-00/451-2.webp?ts=1734265795" ] 2 => array:5 [ "name" => "451-3.png" "alt" => null "width" => "705" "height" => 1326 "path" => "/media/algebra_08/dorofeev/1-00/451-3.webp?ts=1734265795" ] 3 => array:5 [ "name" => "451-4.png" "alt" => null "width" => "705" "height" => 1375 "path" => "/media/algebra_08/dorofeev/1-00/451-4.webp?ts=1734265795" ] 4 => array:5 [ "name" => "451-5.png" "alt" => null "width" => "705" "height" => 1247 "path" => "/media/algebra_08/dorofeev/1-00/451-5.webp?ts=1734265795" ] 5 => array:5 [ "name" => "451-6.png" "alt" => null "width" => "705" "height" => 1543 "path" => "/media/algebra_08/dorofeev/1-00/451-6.webp?ts=1734265795" ] 6 => array:5 [ "name" => "451-7.png" "alt" => null "width" => "705" "height" => 1367 "path" => "/media/algebra_08/dorofeev/1-00/451-7.webp?ts=1734265795" ] 7 => array:5 [ "name" => "451-8.png" "alt" => null "width" => "705" "height" => 1440 "path" => "/media/algebra_08/dorofeev/1-00/451-8.webp?ts=1734265795" ] ] ] #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 {#1109 #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" => 235230 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1107 #items: array:1 [ 0 => App\Models\Edition {#1106 #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" => 731 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Решение 2" "field_order" => "3" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1105 …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" => "tolik" "field_edition_type" => "solution" "field_root_dir" => "2-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1104 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1101 …2} "field_process_formula" => "" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1102 …2} "field_content_source" => null ] #original: array:21 [ "id" => 731 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Решение 2" "field_order" => "3" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1105 …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" => "tolik" "field_edition_type" => "solution" "field_root_dir" => "2-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1104 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1101 …2} "field_process_formula" => "" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1102 …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" => "209561" "type" => "task" ] "img" => array:1 [ 0 => array:5 [ "name" => "451-1.png" "alt" => null "width" => "553" "height" => 1072 "path" => "/media/algebra_08/dorofeev/2-00/451-1.webp?ts=1734264711" ] ] ] #original: array:6 [ "id" => 235230 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1107} "task" => array:2 [ "refs" => "209561" "type" => "task" ] "img" => array:1 [ 0 => array:5 [ "name" => "451-1.png" "alt" => null "width" => "553" "height" => 1072 "path" => "/media/algebra_08/dorofeev/2-00/451-1.webp?ts=1734264711" ] ] ] #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\Element {#1099 #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" => 235374 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1100 #items: array:1 [ 0 => App\Models\Edition {#1098 #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" => 732 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Решение 3" "field_order" => "4" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1091 …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" => "tolik" "field_edition_type" => "solution" "field_root_dir" => "3-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1096 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1095 …2} "field_process_formula" => "" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1094 …2} "field_content_source" => null ] #original: array:21 [ "id" => 732 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Решение 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#escapeWhenCastingToString: false } "task" => array:2 [ "refs" => "209561" "type" => "task" ] "img" => array:1 [ 0 => array:5 [ "name" => "451-1.jpg" "alt" => null "width" => "328" "height" => 2754 "path" => "/media/algebra_08/dorofeev/3-00/451-1.webp?ts=1734264772" ] ] ] #original: array:6 [ "id" => 235374 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1100} "task" => array:2 [ "refs" => "209561" "type" => "task" ] "img" => array:1 [ 0 => array:5 [ "name" => "451-1.jpg" "alt" => null "width" => "328" "height" => 2754 "path" => "/media/algebra_08/dorofeev/3-00/451-1.webp?ts=1734264772" ] ] ] #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\Element {#1093 #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" => 1373619 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1092 #items: array:1 [ 0 => App\Models\Edition {#1089 #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" => 5153 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Решение 4" "field_order" => "5" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1090 …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" => "vadim" "field_edition_type" => "solution" "field_root_dir" => "4-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1088 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1043 …2} "field_process_formula" => "katex" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1041 …2} "field_content_source" => null ] #original: array:21 [ "id" => 5153 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "title" => "Решение 4" "field_order" => "5" "field_publisher" => Illuminate\Database\Eloquent\Collection {#1090 …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" => "vadim" "field_edition_type" => "solution" "field_root_dir" => "4-" "field_responsible" => Illuminate\Database\Eloquent\Collection {#1088 …2} "field_comment" => null "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1043 …2} "field_process_formula" => "katex" "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1041 …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" => "209561" "type" => "task" ] "text" => "<p><strong>а)</strong> $0,3x^2 + 1,6x - 1,2 = 0$<br>Для удобства вычислений умножим все уравнение на 10, чтобы избавиться от десятичных дробей:<br>$10 \cdot (0,3x^2 + 1,6x - 1,2) = 10 \cdot 0$<br>$3x^2 + 16x - 12 = 0$<br>Это квадратное уравнение вида $ax^2 + bx + c = 0$, где $a=3$, $b=16$, $c=-12$.<br>Найдем дискриминант по формуле $D = b^2 - 4ac$:<br>$D = 16^2 - 4 \cdot 3 \cdot (-12) = 256 + 144 = 400$<br>Так как $D > 0$, уравнение имеет два корня. $\sqrt{D} = \sqrt{400} = 20$.<br>Найдем корни уравнения по формуле $x_{1,2} = \frac{-b \pm \sqrt{D}}{2a}$:<br>$x_1 = \frac{-16 + 20}{2 \cdot 3} = \frac{4}{6} = \frac{2}{3}$<br>$x_2 = \frac{-16 - 20}{2 \cdot 3} = \frac{-36}{6} = -6$<br>Ответ: $-6; \frac{2}{3}$.</p><p><strong>б)</strong> $x^2 - \frac{2}{3}x = \frac{8}{3}$<br>Перенесем все члены в левую часть, чтобы получить стандартный вид квадратного уравнения:<br>$x^2 - \frac{2}{3}x - \frac{8}{3} = 0$<br>Умножим все уравнение на 3, чтобы избавиться от дробей:<br>$3x^2 - 2x - 8 = 0$<br>Здесь $a=3$, $b=-2$, $c=-8$.<br>Найдем дискриминант: $D = b^2 - 4ac$<br>$D = (-2)^2 - 4 \cdot 3 \cdot (-8) = 4 + 96 = 100$<br>$\sqrt{D} = \sqrt{100} = 10$<br>Найдем корни:<br>$x_1 = \frac{-(-2) + 10}{2 \cdot 3} = \frac{2 + 10}{6} = \frac{12}{6} = 2$<br>$x_2 = \frac{-(-2) - 10}{2 \cdot 3} = \frac{2 - 10}{6} = \frac{-8}{6} = -\frac{4}{3}$<br>Ответ: $2; -\frac{4}{3}$.</p><p><strong>в)</strong> $\frac{z^2 + z}{2} = 15$<br>Умножим обе части уравнения на 2:<br>$z^2 + z = 30$<br>Перенесем 30 в левую часть:<br>$z^2 + z - 30 = 0$<br>Здесь $a=1$, $b=1$, $c=-30$.<br>Найдем дискриминант: $D = b^2 - 4ac$<br>$D = 1^2 - 4 \cdot 1 \cdot (-30) = 1 + 120 = 121$<br>$\sqrt{D} = \sqrt{121} = 11$<br>Найдем корни:<br>$z_1 = \frac{-1 + 11}{2 \cdot 1} = \frac{10}{2} = 5$<br>$z_2 = \frac{-1 - 11}{2 \cdot 1} = \frac{-12}{2} = -6$<br>Ответ: $5; -6$.</p><p><strong>г)</strong> $x^2 + 1 = \frac{5x}{2}$<br>Умножим обе части уравнения на 2:<br>$2(x^2 + 1) = 5x$<br>$2x^2 + 2 = 5x$<br>Перенесем $5x$ в левую часть:<br>$2x^2 - 5x + 2 = 0$<br>Здесь $a=2$, $b=-5$, $c=2$.<br>Найдем дискриминант: $D = b^2 - 4ac$<br>$D = (-5)^2 - 4 \cdot 2 \cdot 2 = 25 - 16 = 9$<br>$\sqrt{D} = \sqrt{9} = 3$<br>Найдем корни:<br>$x_1 = \frac{-(-5) + 3}{2 \cdot 2} = \frac{5 + 3}{4} = \frac{8}{4} = 2$<br>$x_2 = \frac{-(-5) - 3}{2 \cdot 2} = \frac{5 - 3}{4} = \frac{2}{4} = \frac{1}{2}$<br>Ответ: $2; \frac{1}{2}$.</p><p><strong>д)</strong> $0,1y^2 - 0,9y + 0,8 = 0$<br>Умножим все уравнение на 10, чтобы избавиться от десятичных дробей:<br>$y^2 - 9y + 8 = 0$<br>Это приведенное квадратное уравнение. Решим через дискриминант. Здесь $a=1$, $b=-9$, $c=8$.<br>$D = b^2 - 4ac = (-9)^2 - 4 \cdot 1 \cdot 8 = 81 - 32 = 49$<br>$\sqrt{D} = \sqrt{49} = 7$<br>Найдем корни:<br>$y_1 = \frac{-(-9) + 7}{2 \cdot 1} = \frac{9 + 7}{2} = \frac{16}{2} = 8$<br>$y_2 = \frac{-(-9) - 7}{2 \cdot 1} = \frac{9 - 7}{2} = \frac{2}{2} = 1$<br>Ответ: $1; 8$.</p><p><strong>е)</strong> $\frac{7}{20} - \frac{1}{5}x = x^2$<br>Перенесем все члены в правую часть и запишем уравнение в стандартном виде:<br>$x^2 + \frac{1}{5}x - \frac{7}{20} = 0$<br>Умножим все уравнение на 20 (наименьший общий знаменатель), чтобы избавиться от дробей:<br>$20x^2 + 4x - 7 = 0$<br>Здесь $a=20$, $b=4$, $c=-7$.<br>Найдем дискриминант: $D = b^2 - 4ac$<br>$D = 4^2 - 4 \cdot 20 \cdot (-7) = 16 + 560 = 576$<br>$\sqrt{D} = \sqrt{576} = 24$<br>Найдем корни:<br>$x_1 = \frac{-4 + 24}{2 \cdot 20} = \frac{20}{40} = \frac{1}{2}$<br>$x_2 = \frac{-4 - 24}{2 \cdot 20} = \frac{-28}{40} = -\frac{7}{10}$<br>Ответ: $\frac{1}{2}; -\frac{7}{10}$.</p><p><strong>ж)</strong> $5x^2 = \frac{1-5x}{10}$<br>Умножим обе части уравнения на 10:<br>$50x^2 = 1 - 5x$<br>Перенесем все члены в левую часть:<br>$50x^2 + 5x - 1 = 0$<br>Здесь $a=50$, $b=5$, $c=-1$.<br>Найдем дискриминант: $D = b^2 - 4ac$<br>$D = 5^2 - 4 \cdot 50 \cdot (-1) = 25 + 200 = 225$<br>$\sqrt{D} = \sqrt{225} = 15$<br>Найдем корни:<br>$x_1 = \frac{-5 + 15}{2 \cdot 50} = \frac{10}{100} = \frac{1}{10}$<br>$x_2 = \frac{-5 - 15}{2 \cdot 50} = \frac{-20}{100} = -\frac{1}{5}$<br>Ответ: $\frac{1}{10}; -\frac{1}{5}$.</p><p><strong>з)</strong> $\frac{1}{3}x^2 + \frac{3}{2}x = 3$<br>Перенесем 3 в левую часть:<br>$\frac{1}{3}x^2 + \frac{3}{2}x - 3 = 0$<br>Умножим все уравнение на 6 (наименьший общий знаменатель для 3 и 2), чтобы избавиться от дробей:<br>$6 \cdot (\frac{1}{3}x^2) + 6 \cdot (\frac{3}{2}x) - 6 \cdot 3 = 0$<br>$2x^2 + 9x - 18 = 0$<br>Здесь $a=2$, $b=9$, $c=-18$.<br>Найдем дискриминант: $D = b^2 - 4ac$<br>$D = 9^2 - 4 \cdot 2 \cdot (-18) = 81 + 144 = 225$<br>$\sqrt{D} = \sqrt{225} = 15$<br>Найдем корни:<br>$x_1 = \frac{-9 + 15}{2 \cdot 2} = \frac{6}{4} = \frac{3}{2}$<br>$x_2 = \frac{-9 - 15}{2 \cdot 2} = \frac{-24}{4} = -6$<br>Ответ: $\frac{3}{2}; -6$.</p>" ] #original: array:6 [ "id" => 1373619 "created_at" => "2026-04-10 13:58:26" "updated_at" => null "edition" => Illuminate\Database\Eloquent\Collection {#1092} "task" => array:2 [ "refs" => "209561" "type" => "task" ] "text" => "<p><strong>а)</strong> $0,3x^2 + 1,6x - 1,2 = 0$<br>Для удобства вычислений умножим все уравнение на 10, чтобы избавиться от десятичных дробей:<br>$10 \cdot (0,3x^2 + 1,6x - 1,2) = 10 \cdot 0$<br>$3x^2 + 16x - 12 = 0$<br>Это квадратное уравнение вида $ax^2 + bx + c = 0$, где $a=3$, $b=16$, $c=-12$.<br>Найдем дискриминант по формуле $D = b^2 - 4ac$:<br>$D = 16^2 - 4 \cdot 3 \cdot (-12) = 256 + 144 = 400$<br>Так как $D > 0$, уравнение имеет два корня. $\sqrt{D} = \sqrt{400} = 20$.<br>Найдем корни уравнения по формуле $x_{1,2} = \frac{-b \pm \sqrt{D}}{2a}$:<br>$x_1 = \frac{-16 + 20}{2 \cdot 3} = \frac{4}{6} = \frac{2}{3}$<br>$x_2 = \frac{-16 - 20}{2 \cdot 3} = \frac{-36}{6} = -6$<br>Ответ: $-6; \frac{2}{3}$.</p><p><strong>б)</strong> $x^2 - \frac{2}{3}x = \frac{8}{3}$<br>Перенесем все члены в левую часть, чтобы получить стандартный вид квадратного уравнения:<br>$x^2 - \frac{2}{3}x - \frac{8}{3} = 0$<br>Умножим все уравнение на 3, чтобы избавиться от дробей:<br>$3x^2 - 2x - 8 = 0$<br>Здесь $a=3$, $b=-2$, $c=-8$.<br>Найдем дискриминант: $D = b^2 - 4ac$<br>$D = (-2)^2 - 4 \cdot 3 \cdot (-8) = 4 + 96 = 100$<br>$\sqrt{D} = \sqrt{100} = 10$<br>Найдем корни:<br>$x_1 = \frac{-(-2) + 10}{2 \cdot 3} = \frac{2 + 10}{6} = \frac{12}{6} = 2$<br>$x_2 = \frac{-(-2) - 10}{2 \cdot 3} = \frac{2 - 10}{6} = \frac{-8}{6} = -\frac{4}{3}$<br>Ответ: $2; -\frac{4}{3}$.</p><p><strong>в)</strong> $\frac{z^2 + z}{2} = 15$<br>Умножим обе части уравнения на 2:<br>$z^2 + z = 30$<br>Перенесем 30 в левую часть:<br>$z^2 + z - 30 = 0$<br>Здесь $a=1$, $b=1$, $c=-30$.<br>Найдем дискриминант: $D = b^2 - 4ac$<br>$D = 1^2 - 4 \cdot 1 \cdot (-30) = 1 + 120 = 121$<br>$\sqrt{D} = \sqrt{121} = 11$<br>Найдем корни:<br>$z_1 = \frac{-1 + 11}{2 \cdot 1} = \frac{10}{2} = 5$<br>$z_2 = \frac{-1 - 11}{2 \cdot 1} = \frac{-12}{2} = -6$<br>Ответ: $5; -6$.</p><p><strong>г)</strong> $x^2 + 1 = \frac{5x}{2}$<br>Умножим обе части уравнения на 2:<br>$2(x^2 + 1) = 5x$<br>$2x^2 + 2 = 5x$<br>Перенесем $5x$ в левую часть:<br>$2x^2 - 5x + 2 = 0$<br>Здесь $a=2$, $b=-5$, $c=2$.<br>Найдем дискриминант: $D = b^2 - 4ac$<br>$D = (-5)^2 - 4 \cdot 2 \cdot 2 = 25 - 16 = 9$<br>$\sqrt{D} = \sqrt{9} = 3$<br>Найдем корни:<br>$x_1 = \frac{-(-5) + 3}{2 \cdot 2} = \frac{5 + 3}{4} = \frac{8}{4} = 2$<br>$x_2 = \frac{-(-5) - 3}{2 \cdot 2} = \frac{5 - 3}{4} = \frac{2}{4} = \frac{1}{2}$<br>Ответ: $2; \frac{1}{2}$.</p><p><strong>д)</strong> $0,1y^2 - 0,9y + 0,8 = 0$<br>Умножим все уравнение на 10, чтобы избавиться от десятичных дробей:<br>$y^2 - 9y + 8 = 0$<br>Это приведенное квадратное уравнение. Решим через дискриминант. Здесь $a=1$, $b=-9$, $c=8$.<br>$D = b^2 - 4ac = (-9)^2 - 4 \cdot 1 \cdot 8 = 81 - 32 = 49$<br>$\sqrt{D} = \sqrt{49} = 7$<br>Найдем корни:<br>$y_1 = \frac{-(-9) + 7}{2 \cdot 1} = \frac{9 + 7}{2} = \frac{16}{2} = 8$<br>$y_2 = \frac{-(-9) - 7}{2 \cdot 1} = \frac{9 - 7}{2} = \frac{2}{2} = 1$<br>Ответ: $1; 8$.</p><p><strong>е)</strong> $\frac{7}{20} - \frac{1}{5}x = x^2$<br>Перенесем все члены в правую часть и запишем уравнение в стандартном виде:<br>$x^2 + \frac{1}{5}x - \frac{7}{20} = 0$<br>Умножим все уравнение на 20 (наименьший общий знаменатель), чтобы избавиться от дробей:<br>$20x^2 + 4x - 7 = 0$<br>Здесь $a=20$, $b=4$, $c=-7$.<br>Найдем дискриминант: $D = b^2 - 4ac$<br>$D = 4^2 - 4 \cdot 20 \cdot (-7) = 16 + 560 = 576$<br>$\sqrt{D} = \sqrt{576} = 24$<br>Найдем корни:<br>$x_1 = \frac{-4 + 24}{2 \cdot 20} = \frac{20}{40} = \frac{1}{2}$<br>$x_2 = \frac{-4 - 24}{2 \cdot 20} = \frac{-28}{40} = -\frac{7}{10}$<br>Ответ: $\frac{1}{2}; -\frac{7}{10}$.</p><p><strong>ж)</strong> $5x^2 = \frac{1-5x}{10}$<br>Умножим обе части уравнения на 10:<br>$50x^2 = 1 - 5x$<br>Перенесем все члены в левую часть:<br>$50x^2 + 5x - 1 = 0$<br>Здесь $a=50$, $b=5$, $c=-1$.<br>Найдем дискриминант: $D = b^2 - 4ac$<br>$D = 5^2 - 4 \cdot 50 \cdot (-1) = 25 + 200 = 225$<br>$\sqrt{D} = \sqrt{225} = 15$<br>Найдем корни:<br>$x_1 = \frac{-5 + 15}{2 \cdot 50} = \frac{10}{100} = \frac{1}{10}$<br>$x_2 = \frac{-5 - 15}{2 \cdot 50} = \frac{-20}{100} = -\frac{1}{5}$<br>Ответ: $\frac{1}{10}; -\frac{1}{5}$.</p><p><strong>з)</strong> $\frac{1}{3}x^2 + \frac{3}{2}x = 3$<br>Перенесем 3 в левую часть:<br>$\frac{1}{3}x^2 + \frac{3}{2}x - 3 = 0$<br>Умножим все уравнение на 6 (наименьший общий знаменатель для 3 и 2), чтобы избавиться от дробей:<br>$6 \cdot (\frac{1}{3}x^2) + 6 \cdot (\frac{3}{2}x) - 6 \cdot 3 = 0$<br>$2x^2 + 9x - 18 = 0$<br>Здесь $a=2$, $b=9$, $c=-18$.<br>Найдем дискриминант: $D = b^2 - 4ac$<br>$D = 9^2 - 4 \cdot 2 \cdot (-18) = 81 + 144 = 225$<br>$\sqrt{D} = \sqrt{225} = 15$<br>Найдем корни:<br>$x_1 = \frac{-9 + 15}{2 \cdot 2} = \frac{6}{4} = \frac{3}{2}$<br>$x_2 = \frac{-9 - 15}{2 \cdot 2} = \frac{-24}{4} = -6$<br>Ответ: $\frac{3}{2}; -6$.</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" => "209562" "type" => "task" ] "previous" => array:2 [ "refs" => "209560" "type" => "task" ] "book" => Illuminate\Database\Eloquent\Collection {#1123 #items: array:1 [ 0 => App\Models\Book {#1049} ] #escapeWhenCastingToString: false } "page" => Illuminate\Database\Eloquent\Collection {#1127 #items: array:1 [ 0 => App\Models\BookPage {#1124 #connection: "mysql" #table: "book_pages" #primaryKey: "id" #keyType: "int" +incrementing: true #with: [] #withCount: [] +preventsLazyLoading: false 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[] #observables: [] #relations: [] #touches: [] +timestamps: true +usesUniqueIds: false #hidden: [] #visible: [] #fillable: [] #guarded: array:1 [ 0 => "*" ] }
№451 (с. 132)
Условие. №451 (с. 132)
скриншот условия
451 a) $0,3x^2 + 1,6x - 1,2 = 0;$
б) $x^2 - \frac{2}{3}x = \frac{8}{3};$
В) $\frac{z^2+z}{2}=15;$
Г) $x^2+1=\frac{5x}{2};$
Д) $0,1y^2 - 0,9y + 0,8 = 0;$
е) $\frac{7}{20} - \frac{1}{5}x = x^2;$
Ж) $5x^2 = \frac{1-5x}{10};$
З) $\frac{1}{3}x^2 + \frac{3}{2}x = 3.$
Решение 1. №451 (с. 132)
Решение 2. №451 (с. 132)
Решение 3. №451 (с. 132)
Решение 4. №451 (с. 132)
а) $0,3x^2 + 1,6x - 1,2 = 0$
Для удобства вычислений умножим все уравнение на 10, чтобы избавиться от десятичных дробей:
$10 \cdot (0,3x^2 + 1,6x - 1,2) = 10 \cdot 0$
$3x^2 + 16x - 12 = 0$
Это квадратное уравнение вида $ax^2 + bx + c = 0$, где $a=3$, $b=16$, $c=-12$.
Найдем дискриминант по формуле $D = b^2 - 4ac$:
$D = 16^2 - 4 \cdot 3 \cdot (-12) = 256 + 144 = 400$
Так как $D > 0$, уравнение имеет два корня. $\sqrt{D} = \sqrt{400} = 20$.
Найдем корни уравнения по формуле $x_{1,2} = \frac{-b \pm \sqrt{D}}{2a}$:
$x_1 = \frac{-16 + 20}{2 \cdot 3} = \frac{4}{6} = \frac{2}{3}$
$x_2 = \frac{-16 - 20}{2 \cdot 3} = \frac{-36}{6} = -6$
Ответ: $-6; \frac{2}{3}$.
б) $x^2 - \frac{2}{3}x = \frac{8}{3}$
Перенесем все члены в левую часть, чтобы получить стандартный вид квадратного уравнения:
$x^2 - \frac{2}{3}x - \frac{8}{3} = 0$
Умножим все уравнение на 3, чтобы избавиться от дробей:
$3x^2 - 2x - 8 = 0$
Здесь $a=3$, $b=-2$, $c=-8$.
Найдем дискриминант: $D = b^2 - 4ac$
$D = (-2)^2 - 4 \cdot 3 \cdot (-8) = 4 + 96 = 100$
$\sqrt{D} = \sqrt{100} = 10$
Найдем корни:
$x_1 = \frac{-(-2) + 10}{2 \cdot 3} = \frac{2 + 10}{6} = \frac{12}{6} = 2$
$x_2 = \frac{-(-2) - 10}{2 \cdot 3} = \frac{2 - 10}{6} = \frac{-8}{6} = -\frac{4}{3}$
Ответ: $2; -\frac{4}{3}$.
в) $\frac{z^2 + z}{2} = 15$
Умножим обе части уравнения на 2:
$z^2 + z = 30$
Перенесем 30 в левую часть:
$z^2 + z - 30 = 0$
Здесь $a=1$, $b=1$, $c=-30$.
Найдем дискриминант: $D = b^2 - 4ac$
$D = 1^2 - 4 \cdot 1 \cdot (-30) = 1 + 120 = 121$
$\sqrt{D} = \sqrt{121} = 11$
Найдем корни:
$z_1 = \frac{-1 + 11}{2 \cdot 1} = \frac{10}{2} = 5$
$z_2 = \frac{-1 - 11}{2 \cdot 1} = \frac{-12}{2} = -6$
Ответ: $5; -6$.
г) $x^2 + 1 = \frac{5x}{2}$
Умножим обе части уравнения на 2:
$2(x^2 + 1) = 5x$
$2x^2 + 2 = 5x$
Перенесем $5x$ в левую часть:
$2x^2 - 5x + 2 = 0$
Здесь $a=2$, $b=-5$, $c=2$.
Найдем дискриминант: $D = b^2 - 4ac$
$D = (-5)^2 - 4 \cdot 2 \cdot 2 = 25 - 16 = 9$
$\sqrt{D} = \sqrt{9} = 3$
Найдем корни:
$x_1 = \frac{-(-5) + 3}{2 \cdot 2} = \frac{5 + 3}{4} = \frac{8}{4} = 2$
$x_2 = \frac{-(-5) - 3}{2 \cdot 2} = \frac{5 - 3}{4} = \frac{2}{4} = \frac{1}{2}$
Ответ: $2; \frac{1}{2}$.
д) $0,1y^2 - 0,9y + 0,8 = 0$
Умножим все уравнение на 10, чтобы избавиться от десятичных дробей:
$y^2 - 9y + 8 = 0$
Это приведенное квадратное уравнение. Решим через дискриминант. Здесь $a=1$, $b=-9$, $c=8$.
$D = b^2 - 4ac = (-9)^2 - 4 \cdot 1 \cdot 8 = 81 - 32 = 49$
$\sqrt{D} = \sqrt{49} = 7$
Найдем корни:
$y_1 = \frac{-(-9) + 7}{2 \cdot 1} = \frac{9 + 7}{2} = \frac{16}{2} = 8$
$y_2 = \frac{-(-9) - 7}{2 \cdot 1} = \frac{9 - 7}{2} = \frac{2}{2} = 1$
Ответ: $1; 8$.
е) $\frac{7}{20} - \frac{1}{5}x = x^2$
Перенесем все члены в правую часть и запишем уравнение в стандартном виде:
$x^2 + \frac{1}{5}x - \frac{7}{20} = 0$
Умножим все уравнение на 20 (наименьший общий знаменатель), чтобы избавиться от дробей:
$20x^2 + 4x - 7 = 0$
Здесь $a=20$, $b=4$, $c=-7$.
Найдем дискриминант: $D = b^2 - 4ac$
$D = 4^2 - 4 \cdot 20 \cdot (-7) = 16 + 560 = 576$
$\sqrt{D} = \sqrt{576} = 24$
Найдем корни:
$x_1 = \frac{-4 + 24}{2 \cdot 20} = \frac{20}{40} = \frac{1}{2}$
$x_2 = \frac{-4 - 24}{2 \cdot 20} = \frac{-28}{40} = -\frac{7}{10}$
Ответ: $\frac{1}{2}; -\frac{7}{10}$.
ж) $5x^2 = \frac{1-5x}{10}$
Умножим обе части уравнения на 10:
$50x^2 = 1 - 5x$
Перенесем все члены в левую часть:
$50x^2 + 5x - 1 = 0$
Здесь $a=50$, $b=5$, $c=-1$.
Найдем дискриминант: $D = b^2 - 4ac$
$D = 5^2 - 4 \cdot 50 \cdot (-1) = 25 + 200 = 225$
$\sqrt{D} = \sqrt{225} = 15$
Найдем корни:
$x_1 = \frac{-5 + 15}{2 \cdot 50} = \frac{10}{100} = \frac{1}{10}$
$x_2 = \frac{-5 - 15}{2 \cdot 50} = \frac{-20}{100} = -\frac{1}{5}$
Ответ: $\frac{1}{10}; -\frac{1}{5}$.
з) $\frac{1}{3}x^2 + \frac{3}{2}x = 3$
Перенесем 3 в левую часть:
$\frac{1}{3}x^2 + \frac{3}{2}x - 3 = 0$
Умножим все уравнение на 6 (наименьший общий знаменатель для 3 и 2), чтобы избавиться от дробей:
$6 \cdot (\frac{1}{3}x^2) + 6 \cdot (\frac{3}{2}x) - 6 \cdot 3 = 0$
$2x^2 + 9x - 18 = 0$
Здесь $a=2$, $b=9$, $c=-18$.
Найдем дискриминант: $D = b^2 - 4ac$
$D = 9^2 - 4 \cdot 2 \cdot (-18) = 81 + 144 = 225$
$\sqrt{D} = \sqrt{225} = 15$
Найдем корни:
$x_1 = \frac{-9 + 15}{2 \cdot 2} = \frac{6}{4} = \frac{3}{2}$
$x_2 = \frac{-9 - 15}{2 \cdot 2} = \frac{-24}{4} = -6$
Ответ: $\frac{3}{2}; -6$.
Другие задания:
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