Номер 23, страница 93, часть 2 - гдз по алгебре 10 класс учебник Пак, Ардакулы

Авторы: Пак О. В., Ардакулы Д., Ескендирова Е. В.

Тип: Учебник

Издательство: Алматыкітап баспасы

Год издания: 2019 - 2026

Часть: 2

ISBN: 978-601-01-3958-9

Рекомендовано Министерством образования и науки Республики Казахстан

Часть 2. Глава 6. Применение производной. Параграф 2. Экстремумы и критические точки - номер 23, страница 93.

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                            "updated_at" => null
                            "name" => "Алматыкітап баспасы"
                            "field_cases" => array:6 [ …6]
                            "field_translit" => "almatykitap baspasy"
                          ]
                          #original: array:6 [
                            "id" => 7006
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Алматыкітап баспасы"
                            "field_cases" => array:6 [ …6]
                            "field_translit" => "almatykitap baspasy"
                          ]
                          #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 {#1125
                      #items: array:3 [
                        0 => App\Models\Term {#1126
                          #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" => 7007
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Пак"
                            "field_bio" => null
                            "field_degree_rp" => null
                            "field_foreign_lang_name" => null
                            "field_foreign_lang_patronymic" => null
                            "field_foreign_lang_surname" => null
                            "field_name" => "Олег"
                            "field_patronymic" => "Владимирович"
                            "field_surname_rp" => null
                          ]
                          #original: array:12 [
                            "id" => 7007
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Пак"
                            "field_bio" => null
                            "field_degree_rp" => null
                            "field_foreign_lang_name" => null
                            "field_foreign_lang_patronymic" => null
                            "field_foreign_lang_surname" => null
                            "field_name" => "Олег"
                            "field_patronymic" => "Владимирович"
                            "field_surname_rp" => null
                          ]
                          #changes: []
                          #casts: []
                          #classCastCache: []
                          #attributeCastCache: []
                          #dateFormat: null
                          #appends: []
                          #dispatchesEvents: []
                          #observables: []
                          #relations: []
                          #touches: []
                          +timestamps: true
                          +usesUniqueIds: false
                          #hidden: []
                          #visible: []
                          #fillable: []
                          #guarded: array:1 [
                            0 => "*"
                          ]
                        }
                        1 => App\Models\Term {#1127
                          #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" => 7008
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Ардакулы"
                            "field_bio" => null
                            "field_degree_rp" => null
                            "field_foreign_lang_name" => null
                            "field_foreign_lang_patronymic" => null
                            "field_foreign_lang_surname" => null
                            "field_name" => "Дархан"
                            "field_patronymic" => null
                            "field_surname_rp" => null
                          ]
                          #original: array:12 [
                            "id" => 7008
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Ардакулы"
                            "field_bio" => null
                            "field_degree_rp" => null
                            "field_foreign_lang_name" => null
                            "field_foreign_lang_patronymic" => null
                            "field_foreign_lang_surname" => null
                            "field_name" => "Дархан"
                            "field_patronymic" => null
                            "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 {#1128
                          #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" => 7009
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Ескендирова"
                            "field_bio" => null
                            "field_degree_rp" => null
                            "field_foreign_lang_name" => null
                            "field_foreign_lang_patronymic" => null
                            "field_foreign_lang_surname" => null
                            "field_name" => "Елена"
                            "field_patronymic" => "Викторовна"
                            "field_surname_rp" => null
                          ]
                          #original: array:12 [
                            "id" => 7009
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Ескендирова"
                            "field_bio" => null
                            "field_degree_rp" => null
                            "field_foreign_lang_name" => null
                            "field_foreign_lang_patronymic" => null
                            "field_foreign_lang_surname" => null
                            "field_name" => "Елена"
                            "field_patronymic" => "Викторовна"
                            "field_surname_rp" => null
                          ]
                          #changes: []
                          #casts: []
                          #classCastCache: []
                          #attributeCastCache: []
                          #dateFormat: null
                          #appends: []
                          #dispatchesEvents: []
                          #observables: []
                          #relations: []
                          #touches: []
                          +timestamps: true
                          +usesUniqueIds: false
                          #hidden: []
                          #visible: []
                          #fillable: []
                          #guarded: array:1 [
                            0 => "*"
                          ]
                        }
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1129
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_book_type" => Illuminate\Database\Eloquent\Collection {#1130
                      #items: array:1 [
                        0 => App\Models\Term {#1131
                          #connection: "mysql"
                          #table: "terms"
                          #primaryKey: "id"
                          #keyType: "int"
                          +incrementing: false
                          #with: []
                          #withCount: []
                          +preventsLazyLoading: false
                          #perPage: 15
                          +exists: true
                          +wasRecentlyCreated: false
                          #escapeWhenCastingToString: false
                          #attributes: array:10 [
                            "id" => 6671
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Учебник"
                            "field_book_type_foreign" => null
                            "field_cases" => array:6 [ …6]
                            "field_plural_form" => null
                            "field_short_name" => null
                            "field_short_name_foreign" => null
                            "field_translit" => "uchebnik"
                          ]
                          #original: array:10 [
                            "id" => 6671
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Учебник"
                            "field_book_type_foreign" => null
                            "field_cases" => array:6 [ …6]
                            "field_plural_form" => null
                            "field_short_name" => null
                            "field_short_name_foreign" => null
                            "field_translit" => "uchebnik"
                          ]
                          #changes: []
                          #casts: []
                          #classCastCache: []
                          #attributeCastCache: []
                          #dateFormat: null
                          #appends: []
                          #dispatchesEvents: []
                          #observables: []
                          #relations: []
                          #touches: []
                          +timestamps: true
                          +usesUniqueIds: false
                          #hidden: []
                          #visible: []
                          #fillable: []
                          #guarded: array:1 [
                            0 => "*"
                          ]
                        }
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "field_country" => Illuminate\Database\Eloquent\Collection {#1132
                      #items: array:1 [
                        0 => App\Models\Term {#1133
                          #connection: "mysql"
                          #table: "terms"
                          #primaryKey: "id"
                          #keyType: "int"
                          +incrementing: false
                          #with: []
                          #withCount: []
                          +preventsLazyLoading: false
                          #perPage: 15
                          +exists: true
                          +wasRecentlyCreated: false
                          #escapeWhenCastingToString: false
                          #attributes: array:6 [
                            "id" => 6994
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Казахстан"
                            "field_cases" => array:6 [ …6]
                            "field_translit" => "kazakhstan"
                          ]
                          #original: array:6 [
                            "id" => 6994
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Казахстан"
                            "field_cases" => array:6 [ …6]
                            "field_translit" => "kazakhstan"
                          ]
                          #changes: []
                          #casts: []
                          #classCastCache: []
                          #attributeCastCache: []
                          #dateFormat: null
                          #appends: []
                          #dispatchesEvents: []
                          #observables: []
                          #relations: []
                          #touches: []
                          +timestamps: true
                          +usesUniqueIds: false
                          #hidden: []
                          #visible: []
                          #fillable: []
                          #guarded: array:1 [
                            0 => "*"
                          ]
                        }
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "field_city" => Illuminate\Database\Eloquent\Collection {#1134
                      #items: array:1 [
                        0 => App\Models\Term {#1135
                          #connection: "mysql"
                          #table: "terms"
                          #primaryKey: "id"
                          #keyType: "int"
                          +incrementing: false
                          #with: []
                          #withCount: []
                          +preventsLazyLoading: false
                          #perPage: 15
                          +exists: true
                          +wasRecentlyCreated: false
                          #escapeWhenCastingToString: false
                          #attributes: array:6 [
                            "id" => 6995
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Алматы"
                            "field_cases" => array:6 [ …6]
                            "field_translit" => "almaty"
                          ]
                          #original: array:6 [
                            "id" => 6995
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Алматы"
                            "field_cases" => array:6 [ …6]
                            "field_translit" => "almaty"
                          ]
                          #changes: []
                          #casts: []
                          #classCastCache: []
                          #attributeCastCache: []
                          #dateFormat: null
                          #appends: []
                          #dispatchesEvents: []
                          #observables: []
                          #relations: []
                          #touches: []
                          +timestamps: true
                          +usesUniqueIds: false
                          #hidden: []
                          #visible: []
                          #fillable: []
                          #guarded: array:1 [
                            0 => "*"
                          ]
                        }
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "field_series" => Illuminate\Database\Eloquent\Collection {#1136
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_umk" => Illuminate\Database\Eloquent\Collection {#1137
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1138
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1139
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_publication_number" => null
                    "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1140
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1141
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_under_the_edition_degree" => null
                    "field_cover_description" => null
                    "field_publication_year" => "2019"
                    "field_publication_year_until" => null
                    "field_part" => "1, 2"
                    "field_part_writing" => "Часть"
                    "field_second_foreign_language" => null
                    "field_for_whom" => "Учебник для учащихся 10 класса общеобразовательной школы общественно-гуманитарного направления"
                    "field_allowed" => "Рекомендовано Министерством образования и науки Республики Казахстан"
                    "field_reserve_field" => null
                    "field_link_to_source" => null
                    "field_tasks_count" => "1063"
                    "field_priority" => "6"
                    "field_default_folder" => "/algebra_10/baspasy-u19/"
                    "field_isbn" => "978-601-01-3958-9"
                    "field_cover" => array:1 [
                      0 => "/media/algebra_10/baspasy-u19/covers/cover1.webp?ts=1752152865"
                    ]
                    "field_cover_alts" => array:1 [
                      0 => ""
                    ]
                    "field_covers" => array:1 [
                      0 => array:4 [
                        "path" => "/media/algebra_10/baspasy-u19/covers/cover1.webp?ts=1752152865"
                        "alt" => ""
                        "width" => "1940"
                        "height" => "2895"
                      ]
                    ]
                    "field_popular_book" => null
                    "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1142
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_new_book" => Illuminate\Database\Eloquent\Collection {#1143
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_old_book" => Illuminate\Database\Eloquent\Collection {#1144
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_url" => "/10-klass/algebra/baspasy-pak-uchebnik"
                    "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1145
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_metatags_title" => null
                    "field_metatags_description" => null
                    "field_h1" => null
                    "field_description_top" => null
                    "field_description_bottom" => null
                    "breadcrumbs" => array:3 [
                      "class" => 381
                      "subject" => 542
                      "class_subject" => 387
                    ]
                  ]
                  #original: array:50 [
                    "id" => 4295
                    "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 {#1120}
                    "field_class" => Illuminate\Database\Eloquent\Collection {#1121}
                    "field_publisher" => Illuminate\Database\Eloquent\Collection {#1123}
                    "field_author" => Illuminate\Database\Eloquent\Collection {#1125}
                    "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1129}
                    "field_book_type" => Illuminate\Database\Eloquent\Collection {#1130}
                    "field_country" => Illuminate\Database\Eloquent\Collection {#1132}
                    "field_city" => Illuminate\Database\Eloquent\Collection {#1134}
                    "field_series" => Illuminate\Database\Eloquent\Collection {#1136}
                    "field_umk" => Illuminate\Database\Eloquent\Collection {#1137}
                    "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1138}
                    "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1139}
                    "field_publication_number" => null
                    "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1140}
                    "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1141}
                    "field_under_the_edition_degree" => null
                    "field_cover_description" => null
                    "field_publication_year" => "2019"
                    "field_publication_year_until" => null
                    "field_part" => "1, 2"
                    "field_part_writing" => "Часть"
                    "field_second_foreign_language" => null
                    "field_for_whom" => "Учебник для учащихся 10 класса общеобразовательной школы общественно-гуманитарного направления"
                    "field_allowed" => "Рекомендовано Министерством образования и науки Республики Казахстан"
                    "field_reserve_field" => null
                    "field_link_to_source" => null
                    "field_tasks_count" => "1063"
                    "field_priority" => "6"
                    "field_default_folder" => "/algebra_10/baspasy-u19/"
                    "field_isbn" => "978-601-01-3958-9"
                    "field_cover" => array:1 [
                      0 => "/media/algebra_10/baspasy-u19/covers/cover1.webp?ts=1752152865"
                    ]
                    "field_cover_alts" => array:1 [
                      0 => ""
                    ]
                    "field_covers" => array:1 [
                      0 => array:4 [
                        "path" => "/media/algebra_10/baspasy-u19/covers/cover1.webp?ts=1752152865"
                        "alt" => ""
                        "width" => "1940"
                        "height" => "2895"
                      ]
                    ]
                    "field_popular_book" => null
                    "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1142}
                    "field_new_book" => Illuminate\Database\Eloquent\Collection {#1143}
                    "field_old_book" => Illuminate\Database\Eloquent\Collection {#1144}
                    "field_url" => "/10-klass/algebra/baspasy-pak-uchebnik"
                    "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1145}
                    "field_metatags_title" => null
                    "field_metatags_description" => null
                    "field_h1" => null
                    "field_description_top" => null
                    "field_description_bottom" => null
                    "breadcrumbs" => array:3 [
                      "class" => 381
                      "subject" => 542
                      "class_subject" => 387
                    ]
                  ]
                  #changes: []
                  #casts: []
                  #classCastCache: []
                  #attributeCastCache: []
                  #dateFormat: null
                  #appends: []
                  #dispatchesEvents: []
                  #observables: []
                  #relations: []
                  #touches: []
                  +timestamps: true
                  +usesUniqueIds: false
                  #hidden: []
                  #visible: []
                  #fillable: []
                  #guarded: array:1 [
                    0 => "*"
                  ]
                }
              ]
              #escapeWhenCastingToString: false
            }
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1146
              #items: []
              #escapeWhenCastingToString: false
            }
          ]
          #original: array:24 [
            "id" => 1119426
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "field_display_title" => null
            "field_branch_order" => "2"
            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1119}
            "field_page_start" => "5"
            "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 {#1148}
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1146}
          ]
          #changes: []
          #casts: []
          #classCastCache: []
          #attributeCastCache: []
          #dateFormat: null
          #appends: []
          #dispatchesEvents: []
          #observables: []
          #relations: []
          #touches: []
          +timestamps: true
          +usesUniqueIds: false
          #hidden: []
          #visible: []
          #fillable: []
          #guarded: array:1 [
            0 => "*"
          ]
        }
        1 => App\Models\Branch {#1147
          #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" => 1119442
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "field_display_title" => "Применение производной"
            "field_branch_order" => "6"
            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1152
              #items: array:1 [
                0 => App\Models\Term {#1149
                  #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
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                  #connection: "mysql"
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            "task" => array:2 [
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            "text" => "<p><strong>23. (1) Функция</strong> $f(x)=(x-11)(x-100)^2(x-8)^7$ является производной от некоторой функции $F(x)$. Определите точки локальных экстремумов функции $F(x)$.</p>"
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            "text" => "<p><strong>(1)</strong> Точки локальных экстремумов функции $F(x)$ — это точки из области определения функции, в которых ее производная $F'(x)$ равна нулю или не существует, и при переходе через которые производная меняет свой знак.</p><p>По условию задачи, функция $f(x) = (x-11)(x-100)^2(x-8)^7$ является производной от функции $F(x)$, то есть $F'(x) = f(x)$.</p><p>Сначала найдем критические точки функции $F(x)$, то есть точки, в которых ее производная равна нулю. Поскольку $F'(x)$ является полиномом, она существует при всех значениях $x$.</p><p>Приравняем производную к нулю:</p><p>$F'(x) = (x-11)(x-100)^2(x-8)^7 = 0$</p><p>Корнями этого уравнения являются $x=11$, $x=100$ и $x=8$. Это и есть критические точки функции $F(x)$.</p><p>Теперь исследуем знак производной $F'(x)$ на интервалах, которые образуются этими точками на числовой оси: $(-\infty; 8)$, $(8; 11)$, $(11; 100)$ и $(100; \infty)$. Для этого воспользуемся методом интервалов.</p><p>Знак производной $F'(x)$ зависит от знаков множителей $(x-11)$, $(x-100)^2$ и $(x-8)^7$.</p><p>• Множитель $(x-100)^2$ всегда неотрицателен (поскольку возводится в четную степень), и он не влияет на смену знака производной при переходе через точку $x=100$.<br>• Знак множителя $(x-8)^7$ совпадает со знаком выражения $(x-8)$, так как он возводится в нечетную степень.<br>• Знак множителя $(x-11)$ меняется в точке $x=11$.</p><p>Определим знаки $F'(x)$ на интервалах:</p><p>1. Интервал $(-\infty; 8)$: Возьмем пробную точку, например, $x=0$.<br>$(0-11) < 0$ (знак "-")<br>$(0-100)^2 > 0$ (знак "+")<br>$(0-8)^7 < 0$ (знак "-")<br>Итоговый знак $F'(x)$: $(-) \cdot (+) \cdot (-) = (+)$. Функция $F(x)$ возрастает.</p><p>2. Интервал $(8; 11)$: Возьмем пробную точку, например, $x=10$.<br>$(10-11) < 0$ (знак "-")<br>$(10-100)^2 > 0$ (знак "+")<br>$(10-8)^7 > 0$ (знак "+")<br>Итоговый знак $F'(x)$: $(-) \cdot (+) \cdot (+) = (-)$. Функция $F(x)$ убывает.</p><p>3. Интервал $(11; 100)$: Возьмем пробную точку, например, $x=20$.<br>$(20-11) > 0$ (знак "+")<br>$(20-100)^2 > 0$ (знак "+")<br>$(20-8)^7 > 0$ (знак "+")<br>Итоговый знак $F'(x)$: $(+) \cdot (+) \cdot (+) = (+)$. Функция $F(x)$ возрастает.</p><p>4. Интервал $(100; \infty)$: Возьмем пробную точку, например, $x=101$.<br>$(101-11) > 0$ (знак "+")<br>$(101-100)^2 > 0$ (знак "+")<br>$(101-8)^7 > 0$ (знак "+")<br>Итоговый знак $F'(x)$: $(+) \cdot (+) \cdot (+) = (+)$. Функция $F(x)$ возрастает.</p><p>Теперь проанализируем поведение функции в критических точках:</p><p>• В точке $x=8$ знак производной $F'(x)$ меняется с плюса на минус ($+\to-$). Следовательно, $x=8$ является точкой локального максимума.</p><p>• В точке $x=11$ знак производной $F'(x)$ меняется с минуса на плюс ($-\to+$). Следовательно, $x=11$ является точкой локального минимума.</p><p>• При переходе через точку $x=100$ знак производной $F'(x)$ не меняется (остается положительным). Следовательно, $x=100$ не является точкой локального экстремума.</p><p><strong>Ответ:</strong> точка локального максимума $x=8$, точка локального минимума $x=11$.</p>"
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            "text" => "<p><strong>(1)</strong> Точки локальных экстремумов функции $F(x)$ — это точки из области определения функции, в которых ее производная $F'(x)$ равна нулю или не существует, и при переходе через которые производная меняет свой знак.</p><p>По условию задачи, функция $f(x) = (x-11)(x-100)^2(x-8)^7$ является производной от функции $F(x)$, то есть $F'(x) = f(x)$.</p><p>Сначала найдем критические точки функции $F(x)$, то есть точки, в которых ее производная равна нулю. Поскольку $F'(x)$ является полиномом, она существует при всех значениях $x$.</p><p>Приравняем производную к нулю:</p><p>$F'(x) = (x-11)(x-100)^2(x-8)^7 = 0$</p><p>Корнями этого уравнения являются $x=11$, $x=100$ и $x=8$. Это и есть критические точки функции $F(x)$.</p><p>Теперь исследуем знак производной $F'(x)$ на интервалах, которые образуются этими точками на числовой оси: $(-\infty; 8)$, $(8; 11)$, $(11; 100)$ и $(100; \infty)$. Для этого воспользуемся методом интервалов.</p><p>Знак производной $F'(x)$ зависит от знаков множителей $(x-11)$, $(x-100)^2$ и $(x-8)^7$.</p><p>• Множитель $(x-100)^2$ всегда неотрицателен (поскольку возводится в четную степень), и он не влияет на смену знака производной при переходе через точку $x=100$.<br>• Знак множителя $(x-8)^7$ совпадает со знаком выражения $(x-8)$, так как он возводится в нечетную степень.<br>• Знак множителя $(x-11)$ меняется в точке $x=11$.</p><p>Определим знаки $F'(x)$ на интервалах:</p><p>1. Интервал $(-\infty; 8)$: Возьмем пробную точку, например, $x=0$.<br>$(0-11) < 0$ (знак "-")<br>$(0-100)^2 > 0$ (знак "+")<br>$(0-8)^7 < 0$ (знак "-")<br>Итоговый знак $F'(x)$: $(-) \cdot (+) \cdot (-) = (+)$. Функция $F(x)$ возрастает.</p><p>2. Интервал $(8; 11)$: Возьмем пробную точку, например, $x=10$.<br>$(10-11) < 0$ (знак "-")<br>$(10-100)^2 > 0$ (знак "+")<br>$(10-8)^7 > 0$ (знак "+")<br>Итоговый знак $F'(x)$: $(-) \cdot (+) \cdot (+) = (-)$. Функция $F(x)$ убывает.</p><p>3. Интервал $(11; 100)$: Возьмем пробную точку, например, $x=20$.<br>$(20-11) > 0$ (знак "+")<br>$(20-100)^2 > 0$ (знак "+")<br>$(20-8)^7 > 0$ (знак "+")<br>Итоговый знак $F'(x)$: $(+) \cdot (+) \cdot (+) = (+)$. Функция $F(x)$ возрастает.</p><p>4. Интервал $(100; \infty)$: Возьмем пробную точку, например, $x=101$.<br>$(101-11) > 0$ (знак "+")<br>$(101-100)^2 > 0$ (знак "+")<br>$(101-8)^7 > 0$ (знак "+")<br>Итоговый знак $F'(x)$: $(+) \cdot (+) \cdot (+) = (+)$. Функция $F(x)$ возрастает.</p><p>Теперь проанализируем поведение функции в критических точках:</p><p>• В точке $x=8$ знак производной $F'(x)$ меняется с плюса на минус ($+\to-$). Следовательно, $x=8$ является точкой локального максимума.</p><p>• В точке $x=11$ знак производной $F'(x)$ меняется с минуса на плюс ($-\to+$). Следовательно, $x=11$ является точкой локального минимума.</p><p>• При переходе через точку $x=100$ знак производной $F'(x)$ не меняется (остается положительным). Следовательно, $x=100$ не является точкой локального экстремума.</p><p><strong>Ответ:</strong> точка локального максимума $x=8$, точка локального минимума $x=11$.</p>"
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№23 (с. 93)
Условие. №23 (с. 93)
скриншот условия
Алгебра, 10 класс Учебник, авторы: Пак Олег Владимирович, Ардакулы Дархан, Ескендирова Елена Викторовна, издательство Алматыкітап баспасы, Алматы, 2019, Часть 2, страница 93, номер 23, Условие

23. (1) Функция $f(x)=(x-11)(x-100)^2(x-8)^7$ является производной от некоторой функции $F(x)$. Определите точки локальных экстремумов функции $F(x)$.

Решение 2 (rus). №23 (с. 93)

(1) Точки локальных экстремумов функции $F(x)$ — это точки из области определения функции, в которых ее производная $F'(x)$ равна нулю или не существует, и при переходе через которые производная меняет свой знак.

По условию задачи, функция $f(x) = (x-11)(x-100)^2(x-8)^7$ является производной от функции $F(x)$, то есть $F'(x) = f(x)$.

Сначала найдем критические точки функции $F(x)$, то есть точки, в которых ее производная равна нулю. Поскольку $F'(x)$ является полиномом, она существует при всех значениях $x$.

Приравняем производную к нулю:

$F'(x) = (x-11)(x-100)^2(x-8)^7 = 0$

Корнями этого уравнения являются $x=11$, $x=100$ и $x=8$. Это и есть критические точки функции $F(x)$.

Теперь исследуем знак производной $F'(x)$ на интервалах, которые образуются этими точками на числовой оси: $(-\infty; 8)$, $(8; 11)$, $(11; 100)$ и $(100; \infty)$. Для этого воспользуемся методом интервалов.

Знак производной $F'(x)$ зависит от знаков множителей $(x-11)$, $(x-100)^2$ и $(x-8)^7$.

• Множитель $(x-100)^2$ всегда неотрицателен (поскольку возводится в четную степень), и он не влияет на смену знака производной при переходе через точку $x=100$.
• Знак множителя $(x-8)^7$ совпадает со знаком выражения $(x-8)$, так как он возводится в нечетную степень.
• Знак множителя $(x-11)$ меняется в точке $x=11$.

Определим знаки $F'(x)$ на интервалах:

1. Интервал $(-\infty; 8)$: Возьмем пробную точку, например, $x=0$.
$(0-11) < 0$ (знак "-")
$(0-100)^2 > 0$ (знак "+")
$(0-8)^7 < 0$ (знак "-")
Итоговый знак $F'(x)$: $(-) \cdot (+) \cdot (-) = (+)$. Функция $F(x)$ возрастает.

2. Интервал $(8; 11)$: Возьмем пробную точку, например, $x=10$.
$(10-11) < 0$ (знак "-")
$(10-100)^2 > 0$ (знак "+")
$(10-8)^7 > 0$ (знак "+")
Итоговый знак $F'(x)$: $(-) \cdot (+) \cdot (+) = (-)$. Функция $F(x)$ убывает.

3. Интервал $(11; 100)$: Возьмем пробную точку, например, $x=20$.
$(20-11) > 0$ (знак "+")
$(20-100)^2 > 0$ (знак "+")
$(20-8)^7 > 0$ (знак "+")
Итоговый знак $F'(x)$: $(+) \cdot (+) \cdot (+) = (+)$. Функция $F(x)$ возрастает.

4. Интервал $(100; \infty)$: Возьмем пробную точку, например, $x=101$.
$(101-11) > 0$ (знак "+")
$(101-100)^2 > 0$ (знак "+")
$(101-8)^7 > 0$ (знак "+")
Итоговый знак $F'(x)$: $(+) \cdot (+) \cdot (+) = (+)$. Функция $F(x)$ возрастает.

Теперь проанализируем поведение функции в критических точках:

• В точке $x=8$ знак производной $F'(x)$ меняется с плюса на минус ($+\to-$). Следовательно, $x=8$ является точкой локального максимума.

• В точке $x=11$ знак производной $F'(x)$ меняется с минуса на плюс ($-\to+$). Следовательно, $x=11$ является точкой локального минимума.

• При переходе через точку $x=100$ знак производной $F'(x)$ не меняется (остается положительным). Следовательно, $x=100$ не является точкой локального экстремума.

Ответ: точка локального максимума $x=8$, точка локального минимума $x=11$.

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