Номер 15, страница 69, часть 1 - гдз по алгебре 10 класс учебник Пак, Ардакулы

Алгебра, 10 класс Учебник, авторы: Пак Олег Владимирович, Ардакулы Дархан, Ескендирова Елена Викторовна, издательство Алматыкітап баспасы, Алматы, 2019

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

Тип: Учебник

Издательство: Алматыкітап баспасы

Год издания: 2019 - 2026

Часть: 1

ISBN: 978-601-01-3958-9

Рекомендовано Министерством образования и науки Республики Казахстан

Часть 1. Глава 1. Функции, её свойства и график. Параграф 6. Построение графиков и исследование функций. Задачи - номер 15, страница 69.

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                      "field_nominative_case" => "Часть"
                      "field_prepositional_case" => "Части"
                    ]
                    "field_page_check_not_needed" => "1"
                    "field_short_name" => "ч."
                  ]
                  #original: array:7 [
                    "id" => 31
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "name" => "Часть"
                    "field_cases" => array:6 [
                      "field_accusative_case" => "Часть"
                      "field_creative_case" => "Частью"
                      "field_dative_case" => "Части"
                      "field_genitive_case" => "Части"
                      "field_nominative_case" => "Часть"
                      "field_prepositional_case" => "Части"
                    ]
                    "field_page_check_not_needed" => "1"
                    "field_short_name" => "ч."
                  ]
                  #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" => "6"
            "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" => array:1 [
              0 => "/media/algebra_10/baspasy-u19/covers/cover1.webp?ts=1752152865"
            ]
            "field_branch_covers" => array:1 [
              0 => array:4 [
                "path" => "/media/algebra_10/baspasy-u19/covers/cover1.webp?ts=1752152865"
                "alt" => ""
                "width" => "1940"
                "height" => "2895"
              ]
            ]
            "book" => Illuminate\Database\Eloquent\Collection {#1149
              #items: array:1 [
                0 => App\Models\Book {#1119
                  #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" => 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 {#1121
                      #items: array:1 [
                        0 => App\Models\Term {#1118
                          #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 {#1122
                      #items: array:1 [
                        0 => App\Models\Term {#1123
                          #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" => 5459
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "10"
                            "field_cases" => array:6 [
                              "field_accusative_case" => "десятый"
                              "field_creative_case" => "десятым"
                              "field_dative_case" => "десятому"
                              "field_genitive_case" => "десятого"
                              "field_nominative_case" => "десятый"
                              "field_prepositional_case" => "десятом"
                            ]
                            "field_translit" => "desjatyj"
                          ]
                          #original: array:6 [
                            "id" => 5459
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "10"
                            "field_cases" => array:6 [
                              "field_accusative_case" => "десятый"
                              "field_creative_case" => "десятым"
                              "field_dative_case" => "десятому"
                              "field_genitive_case" => "десятого"
                              "field_nominative_case" => "десятый"
                              "field_prepositional_case" => "десятом"
                            ]
                            "field_translit" => "desjatyj"
                          ]
                          #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 {#1124
                      #items: array:1 [
                        0 => App\Models\Term {#1125
                          #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" => 7006
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Алматыкітап баспасы"
                            "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" => "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 [
                              "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" => "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 {#1126
                      #items: array:3 [
                        0 => 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" => 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 {#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" => 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 {#1129
                          #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 {#1130
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_book_type" => Illuminate\Database\Eloquent\Collection {#1131
                      #items: array:1 [
                        0 => App\Models\Term {#1132
                          #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
                            "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"
                          ]
                          #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 {#1133
                      #items: array:1 [
                        0 => App\Models\Term {#1134
                          #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
                              "field_creative_case" => null
                              "field_dative_case" => null
                              "field_genitive_case" => null
                              "field_nominative_case" => null
                              "field_prepositional_case" => null
                            ]
                            "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 [
                              "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" => "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 {#1135
                      #items: array:1 [
                        0 => App\Models\Term {#1136
                          #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 [
                              "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" => "almaty"
                          ]
                          #original: array:6 [
                            "id" => 6995
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Алматы"
                            "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" => "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
                    }
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        3 => App\Models\Branch {#1159
          #connection: "mysql"
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    "content" => Illuminate\Database\Eloquent\Collection {#1070
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            "task" => array:2 [
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            "text" => "<p><strong>15. (2)</strong> Используя график функции $f(x) = \left| \frac{6-2|x|}{|x|} \right|$ из задачи 13 найдите количество корней уравнения $f(x) = p$ в зависимости от $p$.</p>"
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            ]
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            "task" => array:2 [
              "refs" => "1119679"
              "type" => "task"
            ]
            "text" => "<p><strong>15. (2)</strong> Используя график функции $f(x) = \left| \frac{6-2|x|}{|x|} \right|$ из задачи 13 найдите количество корней уравнения $f(x) = p$ в зависимости от $p$.</p>"
            "img" => array:1 [
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        1 => App\Models\Element {#1089
          #connection: "mysql"
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          #attributes: array:6 [
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            "created_at" => "2026-04-10 13:58:26"
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            "edition" => Illuminate\Database\Eloquent\Collection {#1081
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            "text" => "<p> Для решения задачи необходимо определить количество корней уравнения $f(x) = p$ в зависимости от параметра $p$. Это эквивалентно нахождению числа точек пересечения графика функции $f(x) = \frac{|6-2|x||}{|x|}$ с горизонтальной прямой $y=p$. </p> <p> <strong>1. Анализ функции и построение ее графика.</strong> </p> <p> Область определения функции $D(f)$: $x \neq 0$. Функция является четной, поскольку $f(-x) = \frac{|6-2|-x||}{|-x|} = \frac{|6-2|x||}{|x|} = f(x)$. Следовательно, ее график симметричен относительно оси ординат (OY). Это позволяет нам исследовать функцию только для $x > 0$, а затем симметрично отразить график. </p> <p> При $x > 0$ имеем $|x| = x$, и функция принимает вид $f(x) = \frac{|6-2x|}{x}$. Раскроем модуль в числителе, рассмотрев два случая для $x>0$: </p> <p> а) Если $6-2x \ge 0$, то есть $2x \le 6 \implies x \le 3$. С учетом условия $x>0$, получаем интервал $0 < x \le 3$. На этом интервале $|6-2x| = 6-2x$, и функция равна: $f(x) = \frac{6-2x}{x} = \frac{6}{x} - 2$. </p> <p> б) Если $6-2x < 0$, то есть $x > 3$. На этом интервале $|6-2x| = -(6-2x) = 2x-6$, и функция равна: $f(x) = \frac{2x-6}{x} = 2 - \frac{6}{x}$. </p> <p> Таким образом, для $x > 0$ функция задается кусочно: $f(x) = \begin{cases} \frac{6}{x} - 2, & 0 < x \le 3 \\ 2 - \frac{6}{x}, & x > 3 \end{cases}$ </p> <p> Исследуем ключевые особенности графика для $x > 0$: <br>- Поведение при $x \to 0^+$: $f(x) = \frac{6}{x} - 2 \to +\infty$. Прямая $x=0$ (ось OY) является вертикальной асимптотой. <br>- Поведение при $x \to +\infty$: $f(x) = 2 - \frac{6}{x} \to 2$. Прямая $y=2$ является горизонтальной асимптотой. <br>- На интервале $(0, 3)$ производная $f'(x) = -\frac{6}{x^2} < 0$, значит, функция убывает. <br>- На интервале $(3, +\infty)$ производная $f'(x) = \frac{6}{x^2} > 0$, значит, функция возрастает. <br>- В точке $x=3$ функция достигает своего минимума на $(0, +\infty)$: $f(3) = 0$. </p> <p> График для $x>0$ начинается от $+\infty$ вблизи оси OY, убывает до точки $(3, 0)$, а затем возрастает, приближаясь снизу к асимптоте $y=2$. В силу четности, график для $x<0$ симметричен, имеет минимум в точке $(-3, 0)$ и те же асимптоты. </p> <p> <strong>2. Определение количества корней уравнения $f(x)=p$.</strong> </p> <p> Проанализируем количество точек пересечения графика $y=f(x)$ с прямой $y=p$ для различных значений $p$. <br>- <strong>При $p < 0$:</strong> Прямая $y=p$ находится ниже оси OX. Поскольку $f(x) \ge 0$ для всех $x$, пересечений нет. <br>- <strong>При $p = 0$:</strong> Прямая $y=0$ касается графика в двух точках минимума: $(-3, 0)$ и $(3, 0)$. Таким образом, уравнение имеет 2 корня. <br>- <strong>При $0 < p < 2$:</strong> Прямая $y=p$ пересекает каждую из двух ветвей графика (для $x>0$ и $x<0$) в двух точках: на участке убывания и на участке возрастания. Всего 4 точки пересечения, следовательно, 4 корня. <br>- <strong>При $p = 2$:</strong> Прямая $y=2$ является горизонтальной асимптотой. Найдем точки пересечения, решив уравнение $f(x)=2$: $\frac{|6-2|x||}{|x|} = 2 \implies |6-2|x|| = 2|x|$. Это уравнение распадается на два: $6-2|x| = 2|x|$ или $6-2|x| = -2|x|$. Из первого получаем $4|x|=6$, то есть $|x|=1.5$, что дает два корня $x_1 = 1.5$ и $x_2 = -1.5$. Второе уравнение, $6=0$, не имеет решений. Следовательно, при $p=2$ уравнение имеет 2 корня. <br>- <strong>При $p > 2$:</strong> Прямая $y=p$ пересекает каждую из двух ветвей, уходящих на бесконечность вблизи оси OY, ровно в одной точке. Следовательно, уравнение имеет 2 корня. </p> <p> Ответ: <br>при $p < 0$ корней нет; <br>при $p = 0$ — 2 корня; <br>при $0 < p < 2$ — 4 корня; <br>при $p \ge 2$ — 2 корня. </p>"
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            "text" => "<p> Для решения задачи необходимо определить количество корней уравнения $f(x) = p$ в зависимости от параметра $p$. Это эквивалентно нахождению числа точек пересечения графика функции $f(x) = \frac{|6-2|x||}{|x|}$ с горизонтальной прямой $y=p$. </p> <p> <strong>1. Анализ функции и построение ее графика.</strong> </p> <p> Область определения функции $D(f)$: $x \neq 0$. Функция является четной, поскольку $f(-x) = \frac{|6-2|-x||}{|-x|} = \frac{|6-2|x||}{|x|} = f(x)$. Следовательно, ее график симметричен относительно оси ординат (OY). Это позволяет нам исследовать функцию только для $x > 0$, а затем симметрично отразить график. </p> <p> При $x > 0$ имеем $|x| = x$, и функция принимает вид $f(x) = \frac{|6-2x|}{x}$. Раскроем модуль в числителе, рассмотрев два случая для $x>0$: </p> <p> а) Если $6-2x \ge 0$, то есть $2x \le 6 \implies x \le 3$. С учетом условия $x>0$, получаем интервал $0 < x \le 3$. На этом интервале $|6-2x| = 6-2x$, и функция равна: $f(x) = \frac{6-2x}{x} = \frac{6}{x} - 2$. </p> <p> б) Если $6-2x < 0$, то есть $x > 3$. На этом интервале $|6-2x| = -(6-2x) = 2x-6$, и функция равна: $f(x) = \frac{2x-6}{x} = 2 - \frac{6}{x}$. </p> <p> Таким образом, для $x > 0$ функция задается кусочно: $f(x) = \begin{cases} \frac{6}{x} - 2, & 0 < x \le 3 \\ 2 - \frac{6}{x}, & x > 3 \end{cases}$ </p> <p> Исследуем ключевые особенности графика для $x > 0$: <br>- Поведение при $x \to 0^+$: $f(x) = \frac{6}{x} - 2 \to +\infty$. Прямая $x=0$ (ось OY) является вертикальной асимптотой. <br>- Поведение при $x \to +\infty$: $f(x) = 2 - \frac{6}{x} \to 2$. Прямая $y=2$ является горизонтальной асимптотой. <br>- На интервале $(0, 3)$ производная $f'(x) = -\frac{6}{x^2} < 0$, значит, функция убывает. <br>- На интервале $(3, +\infty)$ производная $f'(x) = \frac{6}{x^2} > 0$, значит, функция возрастает. <br>- В точке $x=3$ функция достигает своего минимума на $(0, +\infty)$: $f(3) = 0$. </p> <p> График для $x>0$ начинается от $+\infty$ вблизи оси OY, убывает до точки $(3, 0)$, а затем возрастает, приближаясь снизу к асимптоте $y=2$. В силу четности, график для $x<0$ симметричен, имеет минимум в точке $(-3, 0)$ и те же асимптоты. </p> <p> <strong>2. Определение количества корней уравнения $f(x)=p$.</strong> </p> <p> Проанализируем количество точек пересечения графика $y=f(x)$ с прямой $y=p$ для различных значений $p$. <br>- <strong>При $p < 0$:</strong> Прямая $y=p$ находится ниже оси OX. Поскольку $f(x) \ge 0$ для всех $x$, пересечений нет. <br>- <strong>При $p = 0$:</strong> Прямая $y=0$ касается графика в двух точках минимума: $(-3, 0)$ и $(3, 0)$. Таким образом, уравнение имеет 2 корня. <br>- <strong>При $0 < p < 2$:</strong> Прямая $y=p$ пересекает каждую из двух ветвей графика (для $x>0$ и $x<0$) в двух точках: на участке убывания и на участке возрастания. Всего 4 точки пересечения, следовательно, 4 корня. <br>- <strong>При $p = 2$:</strong> Прямая $y=2$ является горизонтальной асимптотой. Найдем точки пересечения, решив уравнение $f(x)=2$: $\frac{|6-2|x||}{|x|} = 2 \implies |6-2|x|| = 2|x|$. Это уравнение распадается на два: $6-2|x| = 2|x|$ или $6-2|x| = -2|x|$. Из первого получаем $4|x|=6$, то есть $|x|=1.5$, что дает два корня $x_1 = 1.5$ и $x_2 = -1.5$. Второе уравнение, $6=0$, не имеет решений. Следовательно, при $p=2$ уравнение имеет 2 корня. <br>- <strong>При $p > 2$:</strong> Прямая $y=p$ пересекает каждую из двух ветвей, уходящих на бесконечность вблизи оси OY, ровно в одной точке. Следовательно, уравнение имеет 2 корня. </p> <p> Ответ: <br>при $p < 0$ корней нет; <br>при $p = 0$ — 2 корня; <br>при $0 < p < 2$ — 4 корня; <br>при $p \ge 2$ — 2 корня. </p>"
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№15 (с. 69)
Условие. №15 (с. 69)
скриншот условия
Алгебра, 10 класс Учебник, авторы: Пак Олег Владимирович, Ардакулы Дархан, Ескендирова Елена Викторовна, издательство Алматыкітап баспасы, Алматы, 2019, Часть 1, страница 69, номер 15, Условие

15. (2) Используя график функции $f(x) = \left| \frac{6-2|x|}{|x|} \right|$ из задачи 13 найдите количество корней уравнения $f(x) = p$ в зависимости от $p$.

Решение 2 (rus). №15 (с. 69)

Для решения задачи необходимо определить количество корней уравнения $f(x) = p$ в зависимости от параметра $p$. Это эквивалентно нахождению числа точек пересечения графика функции $f(x) = \frac{|6-2|x||}{|x|}$ с горизонтальной прямой $y=p$.

1. Анализ функции и построение ее графика.

Область определения функции $D(f)$: $x \neq 0$. Функция является четной, поскольку $f(-x) = \frac{|6-2|-x||}{|-x|} = \frac{|6-2|x||}{|x|} = f(x)$. Следовательно, ее график симметричен относительно оси ординат (OY). Это позволяет нам исследовать функцию только для $x > 0$, а затем симметрично отразить график.

При $x > 0$ имеем $|x| = x$, и функция принимает вид $f(x) = \frac{|6-2x|}{x}$. Раскроем модуль в числителе, рассмотрев два случая для $x>0$:

а) Если $6-2x \ge 0$, то есть $2x \le 6 \implies x \le 3$. С учетом условия $x>0$, получаем интервал $0 < x \le 3$. На этом интервале $|6-2x| = 6-2x$, и функция равна: $f(x) = \frac{6-2x}{x} = \frac{6}{x} - 2$.

б) Если $6-2x < 0$, то есть $x > 3$. На этом интервале $|6-2x| = -(6-2x) = 2x-6$, и функция равна: $f(x) = \frac{2x-6}{x} = 2 - \frac{6}{x}$.

Таким образом, для $x > 0$ функция задается кусочно: $f(x) = \begin{cases} \frac{6}{x} - 2, & 0 < x \le 3 \\ 2 - \frac{6}{x}, & x > 3 \end{cases}$

Исследуем ключевые особенности графика для $x > 0$:
- Поведение при $x \to 0^+$: $f(x) = \frac{6}{x} - 2 \to +\infty$. Прямая $x=0$ (ось OY) является вертикальной асимптотой.
- Поведение при $x \to +\infty$: $f(x) = 2 - \frac{6}{x} \to 2$. Прямая $y=2$ является горизонтальной асимптотой.
- На интервале $(0, 3)$ производная $f'(x) = -\frac{6}{x^2} < 0$, значит, функция убывает.
- На интервале $(3, +\infty)$ производная $f'(x) = \frac{6}{x^2} > 0$, значит, функция возрастает.
- В точке $x=3$ функция достигает своего минимума на $(0, +\infty)$: $f(3) = 0$.

График для $x>0$ начинается от $+\infty$ вблизи оси OY, убывает до точки $(3, 0)$, а затем возрастает, приближаясь снизу к асимптоте $y=2$. В силу четности, график для $x<0$ симметричен, имеет минимум в точке $(-3, 0)$ и те же асимптоты.

2. Определение количества корней уравнения $f(x)=p$.

Проанализируем количество точек пересечения графика $y=f(x)$ с прямой $y=p$ для различных значений $p$.
- При $p < 0$: Прямая $y=p$ находится ниже оси OX. Поскольку $f(x) \ge 0$ для всех $x$, пересечений нет.
- При $p = 0$: Прямая $y=0$ касается графика в двух точках минимума: $(-3, 0)$ и $(3, 0)$. Таким образом, уравнение имеет 2 корня.
- При $0 < p < 2$: Прямая $y=p$ пересекает каждую из двух ветвей графика (для $x>0$ и $x<0$) в двух точках: на участке убывания и на участке возрастания. Всего 4 точки пересечения, следовательно, 4 корня.
- При $p = 2$: Прямая $y=2$ является горизонтальной асимптотой. Найдем точки пересечения, решив уравнение $f(x)=2$: $\frac{|6-2|x||}{|x|} = 2 \implies |6-2|x|| = 2|x|$. Это уравнение распадается на два: $6-2|x| = 2|x|$ или $6-2|x| = -2|x|$. Из первого получаем $4|x|=6$, то есть $|x|=1.5$, что дает два корня $x_1 = 1.5$ и $x_2 = -1.5$. Второе уравнение, $6=0$, не имеет решений. Следовательно, при $p=2$ уравнение имеет 2 корня.
- При $p > 2$: Прямая $y=p$ пересекает каждую из двух ветвей, уходящих на бесконечность вблизи оси OY, ровно в одной точке. Следовательно, уравнение имеет 2 корня.

Ответ:
при $p < 0$ корней нет;
при $p = 0$ — 2 корня;
при $0 < p < 2$ — 4 корня;
при $p \ge 2$ — 2 корня.

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