Номер 9, страница 12 - гдз по алгебре 9 класс учебник Солтан, Солтан

Алгебра, 9 класс Учебник, авторы: Солтан Генадий Николаевич, Солтан Алла Евгеньевна, Жумадилова Аманбала Жумадиловна, издательство Кокшетау, Алматы, 2019

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

Повторение курса алгебры 8 класса. Упражнения - номер 9, страница 12.

App\Models\Task {#1024 // 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" => 1107699
    "created_at" => "2026-04-10 13:58:26"
    "updated_at" => null
    "field_page_start" => "12"
    "field_page_end" => null
    "field_url" => "/9-klass/algebra/kokshetau-soltan-uchebnik/1-9"
    "field_display_title" => "9"
    "field_outside_task" => null
    "field_task_type" => Illuminate\Database\Eloquent\Collection {#331
      #items: array:1 [
        0 => App\Models\Term {#1029
          #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 {#1026
      #items: []
      #escapeWhenCastingToString: false
    }
    "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#342
      #items: array:1 [
        0 => App\Models\Branch {#1023
          #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" => 1107636
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "field_display_title" => "Повторение курса алгебры 8 класса"
            "field_branch_order" => null
            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#333
              #items: []
              #escapeWhenCastingToString: false
            }
            "field_page_start" => "7"
            "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 {#1033
              #items: array:1 [
                0 => App\Models\Book {#1030
                  #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 {#1032
                      #items: array:1 [
                        0 => App\Models\Term {#1034
                          #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 [
                              "field_accusative_case" => "алгебру"
                              "field_creative_case" => "алгеброй"
                              "field_dative_case" => "алгебре"
                              "field_genitive_case" => "алгебры"
                              "field_nominative_case" => "алгебра"
                              "field_prepositional_case" => "алгебре"
                            ]
                            "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 [
                              "field_accusative_case" => "алгебру"
                              "field_creative_case" => "алгеброй"
                              "field_dative_case" => "алгебре"
                              "field_genitive_case" => "алгебры"
                              "field_nominative_case" => "алгебра"
                              "field_prepositional_case" => "алгебре"
                            ]
                            "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 {#1035
                      #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" => 5458
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "9"
                            "field_cases" => array:6 [
                              "field_accusative_case" => "девятый"
                              "field_creative_case" => "девятым"
                              "field_dative_case" => "девятому"
                              "field_genitive_case" => "девятого"
                              "field_nominative_case" => "девятый"
                              "field_prepositional_case" => "девятом"
                            ]
                            "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 [
                              "field_accusative_case" => "девятый"
                              "field_creative_case" => "девятым"
                              "field_dative_case" => "девятому"
                              "field_genitive_case" => "девятого"
                              "field_nominative_case" => "девятый"
                              "field_prepositional_case" => "девятом"
                            ]
                            "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 {#1037
                      #items: array:1 [
                        0 => App\Models\Term {#1038
                          #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 [
                              "field_accusative_case" => null
                              "field_creative_case" => null
                              "field_dative_case" => null
                              "field_genitive_case" => null
                              "field_nominative_case" => null
                              "field_prepositional_case" => null
                            ]
                            "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 [
                              "field_accusative_case" => null
                              "field_creative_case" => null
                              "field_dative_case" => null
                              "field_genitive_case" => null
                              "field_nominative_case" => null
                              "field_prepositional_case" => null
                            ]
                            "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 {#1039
                      #items: array:3 [
                        0 => App\Models\Term {#1040
                          #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: []
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                          #relations: []
                          #touches: []
                          +timestamps: true
                          +usesUniqueIds: false
                          #hidden: []
                          #visible: []
                          #fillable: []
                          #guarded: array:1 [
                            0 => "*"
                          ]
                        }
                        1 => App\Models\Term {#1041
                          #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 {#1042
                          #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: []
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                          #attributeCastCache: []
                          #dateFormat: null
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                          #touches: []
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                          #hidden: []
                          #visible: []
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                            0 => "*"
                          ]
                        }
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1043
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_book_type" => Illuminate\Database\Eloquent\Collection {#1044
                      #items: array:1 [
                        0 => App\Models\Term {#1045
                          #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 [
                              "field_accusative_case" => "учебник"
                              "field_creative_case" => "учебником"
                              "field_dative_case" => "учебнику"
                              "field_genitive_case" => "учебника"
                              "field_nominative_case" => "учебник"
                              "field_prepositional_case" => "учебнике"
                            ]
                            "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
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                            "field_cases" => array:6 [
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                              "field_genitive_case" => "учебника"
                              "field_nominative_case" => "учебник"
                              "field_prepositional_case" => "учебнике"
                            ]
                            "field_plural_form" => null
                            "field_short_name" => null
                            "field_short_name_foreign" => null
                            "field_translit" => "uchebnik"
                          ]
                          #changes: []
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                          #attributeCastCache: []
                          #dateFormat: null
                          #appends: []
                          #dispatchesEvents: []
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                          #relations: []
                          #touches: []
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                          #hidden: []
                          #visible: []
                          #fillable: []
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                          ]
                        }
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "field_country" => Illuminate\Database\Eloquent\Collection {#1046
                      #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:6 [
                            "id" => 6994
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Казахстан"
                            "field_cases" => array:6 [
                              "field_accusative_case" => null
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                              "field_dative_case" => null
                              "field_genitive_case" => null
                              "field_nominative_case" => null
                              "field_prepositional_case" => null
                            ]
                            "field_translit" => "kazakhstan"
                          ]
                          #original: array:6 [
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            "text" => "<p><strong>а)</strong> $2x^2 = 5x$</p><p>Это неполное квадратное уравнение. Перенесем все члены в левую часть уравнения, чтобы правая часть стала равной нулю:</p><p>$2x^2 - 5x = 0$</p><p>Теперь вынесем общий множитель $x$ за скобки:</p><p>$x(2x - 5) = 0$</p><p>Произведение равно нулю тогда и только тогда, когда хотя бы один из множителей равен нулю. Следовательно, у нас есть два возможных случая:</p><p>1) $x_1 = 0$</p><p>2) $2x - 5 = 0$</p><p>Решим второе уравнение:</p><p>$2x = 5$</p><p>$x_2 = \frac{5}{2} = 2,5$</p><p>Таким образом, уравнение имеет два корня.</p><p><strong>Ответ:</strong> 0; 2,5.</p><p><strong>б)</strong> $0,3x^2 = 7,5x$</p><p>Это также неполное квадратное уравнение. Перенесем все члены в левую часть:</p><p>$0,3x^2 - 7,5x = 0$</p><p>Вынесем общий множитель $x$ за скобки:</p><p>$x(0,3x - 7,5) = 0$</p><p>Приравниваем каждый множитель к нулю, чтобы найти корни:</p><p>1) $x_1 = 0$</p><p>2) $0,3x - 7,5 = 0$</p><p>Решим второе уравнение:</p><p>$0,3x = 7,5$</p><p>$x_2 = \frac{7,5}{0,3} = \frac{75}{3} = 25$</p><p>Уравнение имеет два корня.</p><p><strong>Ответ:</strong> 0; 25.</p><p><strong>в)</strong> $0,49 - x^2 = 0$</p><p>Это неполное квадратное уравнение вида $ax^2+c=0$. Перенесем $x^2$ в правую часть, чтобы выделить его:</p><p>$x^2 = 0,49$</p><p>Теперь извлечем квадратный корень из обеих частей уравнения. Важно помнить, что корень может быть как положительным, так и отрицательным:</p><p>$x = \pm\sqrt{0,49}$</p><p>$x_1 = 0,7$</p><p>$x_2 = -0,7$</p><p>В качестве альтернативы можно использовать формулу разности квадратов $a^2 - b^2 = (a-b)(a+b)$:</p><p>$(0,7)^2 - x^2 = 0$</p><p>$(0,7 - x)(0,7 + x) = 0$</p><p>Отсюда следует, что $0,7 - x = 0$ (что дает $x=0,7$) или $0,7 + x = 0$ (что дает $x=-0,7$).</p><p><strong>Ответ:</strong> -0,7; 0,7.</p><p><strong>г)</strong> $\frac{1}{4}x^2 - 25 = 0$</p><p>Это неполное квадратное уравнение. Перенесем свободный член $-25$ в правую часть уравнения:</p><p>$\frac{1}{4}x^2 = 25$</p><p>Чтобы найти $x^2$, умножим обе части уравнения на 4:</p><p>$x^2 = 25 \times 4$</p><p>$x^2 = 100$</p><p>Извлечем квадратный корень из обеих частей, не забывая про оба знака:</p><p>$x = \pm\sqrt{100}$</p><p>$x_1 = 10$</p><p>$x_2 = -10$</p><p>Этот пример также можно решить с помощью формулы разности квадратов:</p><p>$(\frac{1}{2}x)^2 - 5^2 = 0$</p><p>$(\frac{1}{2}x - 5)(\frac{1}{2}x + 5) = 0$</p><p>Приравнивая каждый множитель к нулю, получаем: $\frac{1}{2}x - 5 = 0 \implies x=10$ и $\frac{1}{2}x + 5 = 0 \implies x=-10$.</p><p><strong>Ответ:</strong> -10; 10.</p>"
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            "text" => "<p><strong>а)</strong> $2x^2 = 5x$</p><p>Это неполное квадратное уравнение. Перенесем все члены в левую часть уравнения, чтобы правая часть стала равной нулю:</p><p>$2x^2 - 5x = 0$</p><p>Теперь вынесем общий множитель $x$ за скобки:</p><p>$x(2x - 5) = 0$</p><p>Произведение равно нулю тогда и только тогда, когда хотя бы один из множителей равен нулю. Следовательно, у нас есть два возможных случая:</p><p>1) $x_1 = 0$</p><p>2) $2x - 5 = 0$</p><p>Решим второе уравнение:</p><p>$2x = 5$</p><p>$x_2 = \frac{5}{2} = 2,5$</p><p>Таким образом, уравнение имеет два корня.</p><p><strong>Ответ:</strong> 0; 2,5.</p><p><strong>б)</strong> $0,3x^2 = 7,5x$</p><p>Это также неполное квадратное уравнение. Перенесем все члены в левую часть:</p><p>$0,3x^2 - 7,5x = 0$</p><p>Вынесем общий множитель $x$ за скобки:</p><p>$x(0,3x - 7,5) = 0$</p><p>Приравниваем каждый множитель к нулю, чтобы найти корни:</p><p>1) $x_1 = 0$</p><p>2) $0,3x - 7,5 = 0$</p><p>Решим второе уравнение:</p><p>$0,3x = 7,5$</p><p>$x_2 = \frac{7,5}{0,3} = \frac{75}{3} = 25$</p><p>Уравнение имеет два корня.</p><p><strong>Ответ:</strong> 0; 25.</p><p><strong>в)</strong> $0,49 - x^2 = 0$</p><p>Это неполное квадратное уравнение вида $ax^2+c=0$. Перенесем $x^2$ в правую часть, чтобы выделить его:</p><p>$x^2 = 0,49$</p><p>Теперь извлечем квадратный корень из обеих частей уравнения. Важно помнить, что корень может быть как положительным, так и отрицательным:</p><p>$x = \pm\sqrt{0,49}$</p><p>$x_1 = 0,7$</p><p>$x_2 = -0,7$</p><p>В качестве альтернативы можно использовать формулу разности квадратов $a^2 - b^2 = (a-b)(a+b)$:</p><p>$(0,7)^2 - x^2 = 0$</p><p>$(0,7 - x)(0,7 + x) = 0$</p><p>Отсюда следует, что $0,7 - x = 0$ (что дает $x=0,7$) или $0,7 + x = 0$ (что дает $x=-0,7$).</p><p><strong>Ответ:</strong> -0,7; 0,7.</p><p><strong>г)</strong> $\frac{1}{4}x^2 - 25 = 0$</p><p>Это неполное квадратное уравнение. Перенесем свободный член $-25$ в правую часть уравнения:</p><p>$\frac{1}{4}x^2 = 25$</p><p>Чтобы найти $x^2$, умножим обе части уравнения на 4:</p><p>$x^2 = 25 \times 4$</p><p>$x^2 = 100$</p><p>Извлечем квадратный корень из обеих частей, не забывая про оба знака:</p><p>$x = \pm\sqrt{100}$</p><p>$x_1 = 10$</p><p>$x_2 = -10$</p><p>Этот пример также можно решить с помощью формулы разности квадратов:</p><p>$(\frac{1}{2}x)^2 - 5^2 = 0$</p><p>$(\frac{1}{2}x - 5)(\frac{1}{2}x + 5) = 0$</p><p>Приравнивая каждый множитель к нулю, получаем: $\frac{1}{2}x - 5 = 0 \implies x=10$ и $\frac{1}{2}x + 5 = 0 \implies x=-10$.</p><p><strong>Ответ:</strong> -10; 10.</p>"
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            "content" => Illuminate\Database\Eloquent\Collection {#1125
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            "tasks" => Illuminate\Database\Eloquent\Collection {#1134
              #items: array:10 [
                0 => App\Models\Task {#1135
                  #connection: "mysql"
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                    0 => "*"
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                }
                1 => App\Models\Task {#1173
                  #connection: "mysql"
                  #table: "tasks"
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                    "field_task_type" => Illuminate\Database\Eloquent\Collection {#1174 …2}
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                    "parent_branches" => Illuminate\Database\Eloquent\Collection {#1177 …2}
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                2 => App\Models\Task {#1186
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                    "field_task_type" => Illuminate\Database\Eloquent\Collection {#1187 …2}
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                3 => App\Models\Task {#1197
                  #connection: "mysql"
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                    "field_task_type" => Illuminate\Database\Eloquent\Collection {#1198 …2}
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                4 => App\Models\Task {#1210
                  #connection: "mysql"
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                    "field_url" => "/9-klass/algebra/kokshetau-soltan-uchebnik/1-11"
                    "field_display_title" => "11"
                    "field_outside_task" => null
                    "field_task_type" => Illuminate\Database\Eloquent\Collection {#1211 …2}
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                    0 => "*"
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                }
                5 => App\Models\Task {#1223
                  #connection: "mysql"
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                  #primaryKey: "id"
                  #keyType: "int"
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                  #attributes: array:24 [
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                    "created_at" => "2026-04-10 13:58:26"
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                    "field_task_type" => Illuminate\Database\Eloquent\Collection {#1224 …2}
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                    "edition_groups" => Illuminate\Database\Eloquent\Collection {#1225 …2}
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                    "field_task_type" => Illuminate\Database\Eloquent\Collection {#1224 …2}
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                    0 => "*"
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                }
                6 => App\Models\Task {#1234
                  #connection: "mysql"
                  #table: "tasks"
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                  #keyType: "int"
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                    "field_url" => "/9-klass/algebra/kokshetau-soltan-uchebnik/1-13"
                    "field_display_title" => "13"
                    "field_outside_task" => null
                    "field_task_type" => Illuminate\Database\Eloquent\Collection {#1235 …2}
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                    "edition_groups" => Illuminate\Database\Eloquent\Collection {#1236 …2}
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№9 (с. 12)
Решение. №9 (с. 12)
Алгебра, 9 класс Учебник, авторы: Солтан Генадий Николаевич, Солтан Алла Евгеньевна, Жумадилова Аманбала Жумадиловна, издательство Кокшетау, Алматы, 2019, страница 12, номер 9, Решение
Алгебра, 9 класс Учебник, авторы: Солтан Генадий Николаевич, Солтан Алла Евгеньевна, Жумадилова Аманбала Жумадиловна, издательство Кокшетау, Алматы, 2019, страница 12, номер 9, Решение (продолжение 2)
Решение 2 (rus). №9 (с. 12)

а) $2x^2 = 5x$

Это неполное квадратное уравнение. Перенесем все члены в левую часть уравнения, чтобы правая часть стала равной нулю:

$2x^2 - 5x = 0$

Теперь вынесем общий множитель $x$ за скобки:

$x(2x - 5) = 0$

Произведение равно нулю тогда и только тогда, когда хотя бы один из множителей равен нулю. Следовательно, у нас есть два возможных случая:

1) $x_1 = 0$

2) $2x - 5 = 0$

Решим второе уравнение:

$2x = 5$

$x_2 = \frac{5}{2} = 2,5$

Таким образом, уравнение имеет два корня.

Ответ: 0; 2,5.

б) $0,3x^2 = 7,5x$

Это также неполное квадратное уравнение. Перенесем все члены в левую часть:

$0,3x^2 - 7,5x = 0$

Вынесем общий множитель $x$ за скобки:

$x(0,3x - 7,5) = 0$

Приравниваем каждый множитель к нулю, чтобы найти корни:

1) $x_1 = 0$

2) $0,3x - 7,5 = 0$

Решим второе уравнение:

$0,3x = 7,5$

$x_2 = \frac{7,5}{0,3} = \frac{75}{3} = 25$

Уравнение имеет два корня.

Ответ: 0; 25.

в) $0,49 - x^2 = 0$

Это неполное квадратное уравнение вида $ax^2+c=0$. Перенесем $x^2$ в правую часть, чтобы выделить его:

$x^2 = 0,49$

Теперь извлечем квадратный корень из обеих частей уравнения. Важно помнить, что корень может быть как положительным, так и отрицательным:

$x = \pm\sqrt{0,49}$

$x_1 = 0,7$

$x_2 = -0,7$

В качестве альтернативы можно использовать формулу разности квадратов $a^2 - b^2 = (a-b)(a+b)$:

$(0,7)^2 - x^2 = 0$

$(0,7 - x)(0,7 + x) = 0$

Отсюда следует, что $0,7 - x = 0$ (что дает $x=0,7$) или $0,7 + x = 0$ (что дает $x=-0,7$).

Ответ: -0,7; 0,7.

г) $\frac{1}{4}x^2 - 25 = 0$

Это неполное квадратное уравнение. Перенесем свободный член $-25$ в правую часть уравнения:

$\frac{1}{4}x^2 = 25$

Чтобы найти $x^2$, умножим обе части уравнения на 4:

$x^2 = 25 \times 4$

$x^2 = 100$

Извлечем квадратный корень из обеих частей, не забывая про оба знака:

$x = \pm\sqrt{100}$

$x_1 = 10$

$x_2 = -10$

Этот пример также можно решить с помощью формулы разности квадратов:

$(\frac{1}{2}x)^2 - 5^2 = 0$

$(\frac{1}{2}x - 5)(\frac{1}{2}x + 5) = 0$

Приравнивая каждый множитель к нулю, получаем: $\frac{1}{2}x - 5 = 0 \implies x=10$ и $\frac{1}{2}x + 5 = 0 \implies x=-10$.

Ответ: -10; 10.

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