Номер 29, страница 94, 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 29, страница 94.

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                          #connection: "mysql"
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                    }
                    "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
                    ]
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                  #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
                    ]
                  ]
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                  #classCastCache: []
                  #attributeCastCache: []
                  #dateFormat: null
                  #appends: []
                  #dispatchesEvents: []
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                  #relations: []
                  #touches: []
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                  #hidden: []
                  #visible: []
                  #fillable: []
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                    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"
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            "field_branch_cover" => []
            "field_branch_covers" => []
            "book" => Illuminate\Database\Eloquent\Collection {#1148}
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1146}
          ]
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          #attributeCastCache: []
          #dateFormat: null
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            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
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          #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 [
                      "field_accusative_case" => "Главу"
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                      "field_dative_case" => "Главе"
                      "field_genitive_case" => "Главы"
                      "field_nominative_case" => "Глава"
                      "field_prepositional_case" => "Главе"
                    ]
                    "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 [
                      "field_accusative_case" => "Главу"
                      "field_creative_case" => "Главой"
                      "field_dative_case" => "Главе"
                      "field_genitive_case" => "Главы"
                      "field_nominative_case" => "Глава"
                      "field_prepositional_case" => "Главе"
                    ]
                    "field_page_check_not_needed" => null
                    "field_short_name" => null
                  ]
                  #changes: []
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                  #attributeCastCache: []
                  #dateFormat: null
                  #appends: []
                  #dispatchesEvents: []
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                  #relations: []
                  #touches: []
                  +timestamps: true
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                  #hidden: []
                  #visible: []
                  #fillable: []
                  #guarded: array:1 [
                    0 => "*"
                  ]
                }
              ]
              #escapeWhenCastingToString: false
            }
            "field_page_start" => "76"
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            "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 {#1151
              #items: array:1 [
                0 => App\Models\Book {#1118}
              ]
              #escapeWhenCastingToString: false
            }
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1150
              #items: array:1 [
                0 => App\Models\Branch {#1034}
              ]
              #escapeWhenCastingToString: false
            }
          ]
          #original: 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}
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            "field_branch_covers" => []
            "book" => Illuminate\Database\Eloquent\Collection {#1151}
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          ]
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          #attributeCastCache: []
          #dateFormat: null
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          #hidden: []
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            0 => "*"
          ]
        }
        2 => App\Models\Branch {#1153
          #connection: "mysql"
          #table: "branches"
          #primaryKey: "id"
          #keyType: "int"
          +incrementing: true
          #with: []
          #withCount: []
          +preventsLazyLoading: false
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          +exists: true
          +wasRecentlyCreated: false
          #escapeWhenCastingToString: false
          #attributes: array:24 [
            "id" => 1119446
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "field_display_title" => "Экстремумы и критические точки"
            "field_branch_order" => "2"
            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1157
              #items: array:1 [
                0 => App\Models\Term {#1154
                  #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" => 32
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "name" => "Параграф"
                    "field_cases" => array:6 [
                      "field_accusative_case" => "Параграф"
                      "field_creative_case" => "Параграфом"
                      "field_dative_case" => "Параграфу"
                      "field_genitive_case" => "Параграфа"
                      "field_nominative_case" => "Параграф"
                      "field_prepositional_case" => "Параграфе"
                    ]
                    "field_page_check_not_needed" => null
                    "field_short_name" => "§"
                  ]
                  #original: array:7 [
                    "id" => 32
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "name" => "Параграф"
                    "field_cases" => array:6 [
                      "field_accusative_case" => "Параграф"
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                      "field_dative_case" => "Параграфу"
                      "field_genitive_case" => "Параграфа"
                      "field_nominative_case" => "Параграф"
                      "field_prepositional_case" => "Параграфе"
                    ]
                    "field_page_check_not_needed" => null
                    "field_short_name" => "§"
                  ]
                  #changes: []
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                  #attributeCastCache: []
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                  #dispatchesEvents: []
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                  #visible: []
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                    0 => "*"
                  ]
                }
              ]
              #escapeWhenCastingToString: false
            }
            "field_page_start" => "86"
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            "field_navigation_title" => null
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                0 => App\Models\Book {#1118}
              ]
              #escapeWhenCastingToString: false
            }
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1165
              #items: array:1 [
                0 => App\Models\Branch {#1164
                  #connection: "mysql"
                  #table: "branches"
                  #primaryKey: "id"
                  #keyType: "int"
                  +incrementing: true
                  #with: []
                  #withCount: []
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                  +exists: true
                  +wasRecentlyCreated: false
                  #escapeWhenCastingToString: false
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                    "id" => 1119442
                    "created_at" => "2026-04-10 13:58:26"
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                    "field_url" => null
                    "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1166
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                        0 => App\Models\Term {#1149}
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "field_page_start" => "76"
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                        0 => App\Models\Book {#1118}
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "branch_parent" => Illuminate\Database\Eloquent\Collection {#1168
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                      ]
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                  ]
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                    0 => "*"
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              #escapeWhenCastingToString: false
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          #original: array:24 [
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            "field_display_title" => "Экстремумы и критические точки"
            "field_branch_order" => "2"
            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1157}
            "field_page_start" => "86"
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            "field_h1" => null
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            "field_branch_covers" => []
            "book" => Illuminate\Database\Eloquent\Collection {#1156}
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1165}
          ]
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          #attributeCastCache: []
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          +timestamps: true
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          #visible: []
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            0 => "*"
          ]
        }
      ]
      #escapeWhenCastingToString: false
    }
    "content" => Illuminate\Database\Eloquent\Collection {#1070
      #items: array:2 [
        0 => App\Models\Element {#1097
          #connection: "mysql"
          #table: "elements"
          #primaryKey: "id"
          #keyType: "int"
          +incrementing: true
          #with: []
          #withCount: []
          +preventsLazyLoading: false
          #perPage: 15
          +exists: true
          +wasRecentlyCreated: false
          #escapeWhenCastingToString: false
          #attributes: array:7 [
            "id" => 1301051
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "edition" => Illuminate\Database\Eloquent\Collection {#1087
              #items: array:1 [
                0 => App\Models\Edition {#1096
                  #connection: "mysql"
                  #table: "editions"
                  #primaryKey: "id"
                  #keyType: "int"
                  +incrementing: false
                  #with: []
                  #withCount: []
                  +preventsLazyLoading: false
                  #perPage: 15
                  +exists: true
                  +wasRecentlyCreated: false
                  #escapeWhenCastingToString: false
                  #attributes: array:21 [
                    "id" => 4962
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "title" => "Условие"
                    "field_order" => "1"
                    "field_publisher" => Illuminate\Database\Eloquent\Collection {#1094
                      #items: array:1 [
                        0 => App\Models\Term {#1095 …30}
                      ]
                      #escapeWhenCastingToString: false
                    }
                    "field_content_type" => "free"
                    "field_content_mode" => "text, image"
                    "field_page_content_mode" => "image"
                    "field_content_text_checked" => null
                    "field_page_content_text_checked" => "0"
                    "field_solution_author" => "Автор"
                    "field_moderator" => "pasha"
                    "field_edition_type" => "statement"
                    "field_root_dir" => "0-"
                    "field_responsible" => Illuminate\Database\Eloquent\Collection {#1093
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_comment" => null
                    "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1091
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_process_formula" => "katex"
                    "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1092
                      #items: []
                      #escapeWhenCastingToString: false
                    }
                    "field_content_source" => null
                  ]
                  #original: array:21 [
                    "id" => 4962
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "title" => "Условие"
                    "field_order" => "1"
                    "field_publisher" => Illuminate\Database\Eloquent\Collection {#1094}
                    "field_content_type" => "free"
                    "field_content_mode" => "text, image"
                    "field_page_content_mode" => "image"
                    "field_content_text_checked" => null
                    "field_page_content_text_checked" => "0"
                    "field_solution_author" => "Автор"
                    "field_moderator" => "pasha"
                    "field_edition_type" => "statement"
                    "field_root_dir" => "0-"
                    "field_responsible" => Illuminate\Database\Eloquent\Collection {#1093}
                    "field_comment" => null
                    "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1091}
                    "field_process_formula" => "katex"
                    "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1092}
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                  +timestamps: true
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                  #visible: []
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                }
              ]
              #escapeWhenCastingToString: false
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            "task" => array:2 [
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              "type" => "task"
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            "text" => "<p><strong>29.</strong> (2)</p><p>Велосипедист каждую минуту проезжает на 500 м меньше, чем мотоциклист, поэтому на путь в 120 км он затрачивает времени на 2 часа больше, чем мотоциклист. Вычислите скорость велосипедиста.</p>"
            "img" => array:1 [
              0 => array:5 [
                "name" => "29-1.jpg"
                "alt" => null
                "width" => "1663"
                "height" => 262
                "path" => "/media/algebra_10/baspasy-u19/0-6-2zad/29-1.webp?ts=1753534906"
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            ]
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          #original: array:7 [
            "id" => 1301051
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "edition" => Illuminate\Database\Eloquent\Collection {#1087}
            "task" => array:2 [
              "refs" => "1120366"
              "type" => "task"
            ]
            "text" => "<p><strong>29.</strong> (2)</p><p>Велосипедист каждую минуту проезжает на 500 м меньше, чем мотоциклист, поэтому на путь в 120 км он затрачивает времени на 2 часа больше, чем мотоциклист. Вычислите скорость велосипедиста.</p>"
            "img" => array:1 [
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                "name" => "29-1.jpg"
                "alt" => null
                "width" => "1663"
                "height" => 262
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        }
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          #connection: "mysql"
          #table: "elements"
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            "id" => 1552087
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "edition" => Illuminate\Database\Eloquent\Collection {#1081
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                  #table: "editions"
                  #primaryKey: "id"
                  #keyType: "int"
                  +incrementing: false
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                  #attributes: array:21 [
                    "id" => 5659
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "title" => "Решение 2 (rus)"
                    "field_order" => "3"
                    "field_publisher" => Illuminate\Database\Eloquent\Collection {#1086
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                        0 => App\Models\Term {#1088 …30}
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                    "field_content_type" => "free"
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                    "field_solution_author" => "Gemini 2.5 Pro"
                    "field_moderator" => "tolik"
                    "field_edition_type" => "solution"
                    "field_root_dir" => "2-"
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                      #escapeWhenCastingToString: false
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                    "id" => 5659
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                    "field_moderator" => "tolik"
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                  ]
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                    0 => "*"
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              ]
              #escapeWhenCastingToString: false
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            "task" => array:2 [
              "refs" => "1120366"
              "type" => "task"
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            "text" => "<p>Для решения задачи введем переменные и составим уравнение.</p><p>Пусть $v_в$ — скорость велосипедиста, а $v_м$ — скорость мотоциклиста. Расстояние $S = 120$ км.</p><p>Из условия известно, что велосипедист каждую минуту проезжает на 500 м меньше, чем мотоциклист. Выразим эту разницу в км/ч.</p><p>500 метров — это 0,5 км.1 минута — это $\frac{1}{60}$ часа.Следовательно, разница в скорости составляет 0,5 км за $\frac{1}{60}$ часа. Чтобы найти разницу в км/ч, нужно умножить расстояние на 60:</p><p>$v_м - v_в = 0.5 \text{ км} \times 60 = 30 \text{ км/ч}$</p><p>Отсюда скорость мотоциклиста: $v_м = v_в + 30$.</p><p>Время, которое велосипедист тратит на путь в 120 км, равно $t_в = \frac{S}{v_в} = \frac{120}{v_в}$.</p><p>Время, которое мотоциклист тратит на тот же путь, равно $t_м = \frac{S}{v_м} = \frac{120}{v_в + 30}$.</p><p>По условию, велосипедист затрачивает на 2 часа больше, чем мотоциклист, то есть $t_в - t_м = 2$. Составим и решим уравнение:</p><p>$\frac{120}{v_в} - \frac{120}{v_в + 30} = 2$</p><p>Приведем левую часть к общему знаменателю:</p><p>$\frac{120(v_в + 30) - 120v_в}{v_в(v_в + 30)} = 2$</p><p>Раскроем скобки в числителе:</p><p>$\frac{120v_в + 3600 - 120v_в}{v_в^2 + 30v_в} = 2$</p><p>$\frac{3600}{v_в^2 + 30v_в} = 2$</p><p>$3600 = 2(v_в^2 + 30v_в)$</p><p>Разделим обе части на 2:</p><p>$1800 = v_в^2 + 30v_в$</p><p>Получаем квадратное уравнение:</p><p>$v_в^2 + 30v_в - 1800 = 0$</p><p>Решим его через дискриминант:</p><p>$D = b^2 - 4ac = 30^2 - 4 \cdot 1 \cdot (-1800) = 900 + 7200 = 8100$</p><p>$\sqrt{D} = \sqrt{8100} = 90$</p><p>Найдем корни уравнения:</p><p>$(v_в)_1 = \frac{-30 + 90}{2 \cdot 1} = \frac{60}{2} = 30$</p><p>$(v_в)_2 = \frac{-30 - 90}{2 \cdot 1} = \frac{-120}{2} = -60$</p><p>Так как скорость не может быть отрицательной, корень -60 нам не подходит. Следовательно, скорость велосипедиста равна 30 км/ч.</p><p><strong>Ответ:</strong> 30 км/ч.</p>"
          ]
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            "id" => 1552087
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "edition" => Illuminate\Database\Eloquent\Collection {#1081}
            "task" => array:2 [
              "refs" => "1120366"
              "type" => "task"
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            "text" => "<p>Для решения задачи введем переменные и составим уравнение.</p><p>Пусть $v_в$ — скорость велосипедиста, а $v_м$ — скорость мотоциклиста. Расстояние $S = 120$ км.</p><p>Из условия известно, что велосипедист каждую минуту проезжает на 500 м меньше, чем мотоциклист. Выразим эту разницу в км/ч.</p><p>500 метров — это 0,5 км.1 минута — это $\frac{1}{60}$ часа.Следовательно, разница в скорости составляет 0,5 км за $\frac{1}{60}$ часа. Чтобы найти разницу в км/ч, нужно умножить расстояние на 60:</p><p>$v_м - v_в = 0.5 \text{ км} \times 60 = 30 \text{ км/ч}$</p><p>Отсюда скорость мотоциклиста: $v_м = v_в + 30$.</p><p>Время, которое велосипедист тратит на путь в 120 км, равно $t_в = \frac{S}{v_в} = \frac{120}{v_в}$.</p><p>Время, которое мотоциклист тратит на тот же путь, равно $t_м = \frac{S}{v_м} = \frac{120}{v_в + 30}$.</p><p>По условию, велосипедист затрачивает на 2 часа больше, чем мотоциклист, то есть $t_в - t_м = 2$. Составим и решим уравнение:</p><p>$\frac{120}{v_в} - \frac{120}{v_в + 30} = 2$</p><p>Приведем левую часть к общему знаменателю:</p><p>$\frac{120(v_в + 30) - 120v_в}{v_в(v_в + 30)} = 2$</p><p>Раскроем скобки в числителе:</p><p>$\frac{120v_в + 3600 - 120v_в}{v_в^2 + 30v_в} = 2$</p><p>$\frac{3600}{v_в^2 + 30v_в} = 2$</p><p>$3600 = 2(v_в^2 + 30v_в)$</p><p>Разделим обе части на 2:</p><p>$1800 = v_в^2 + 30v_в$</p><p>Получаем квадратное уравнение:</p><p>$v_в^2 + 30v_в - 1800 = 0$</p><p>Решим его через дискриминант:</p><p>$D = b^2 - 4ac = 30^2 - 4 \cdot 1 \cdot (-1800) = 900 + 7200 = 8100$</p><p>$\sqrt{D} = \sqrt{8100} = 90$</p><p>Найдем корни уравнения:</p><p>$(v_в)_1 = \frac{-30 + 90}{2 \cdot 1} = \frac{60}{2} = 30$</p><p>$(v_в)_2 = \frac{-30 - 90}{2 \cdot 1} = \frac{-120}{2} = -60$</p><p>Так как скорость не может быть отрицательной, корень -60 нам не подходит. Следовательно, скорость велосипедиста равна 30 км/ч.</p><p><strong>Ответ:</strong> 30 км/ч.</p>"
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                    "created_at" => "2026-04-10 13:58:26"
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                    "updated_at" => null
                    "edition" => Illuminate\Database\Eloquent\Collection {#1107}
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                    "created_at" => "2026-04-10 13:58:26"
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                    "field_page_end" => "94"
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                      #escapeWhenCastingToString: false
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                    "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1272
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                      #escapeWhenCastingToString: false
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                    "parent_branches" => Illuminate\Database\Eloquent\Collection {#1273
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                        0 => App\Models\Branch {#1115}
                        1 => App\Models\Branch {#1147}
                        2 => App\Models\Branch {#1153}
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                      #escapeWhenCastingToString: false
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                    "content" => Illuminate\Database\Eloquent\Collection {#1275
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                    "book" => Illuminate\Database\Eloquent\Collection {#1281
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                      #escapeWhenCastingToString: false
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                    "book" => Illuminate\Database\Eloquent\Collection {#1281}
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                    0 => "*"
                  ]
                }
                1 => App\Models\Task {#1276
                  #connection: "mysql"
                  #table: "tasks"
                  #primaryKey: "id"
                  #keyType: "int"
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                  +exists: true
                  +wasRecentlyCreated: false
                  #escapeWhenCastingToString: false
                  #attributes: array:24 [
                    "id" => 1120366
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
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№29 (с. 94)
Условие. №29 (с. 94)
скриншот условия
Алгебра, 10 класс Учебник, авторы: Пак Олег Владимирович, Ардакулы Дархан, Ескендирова Елена Викторовна, издательство Алматыкітап баспасы, Алматы, 2019, Часть 2, страница 94, номер 29, Условие

29. (2)

Велосипедист каждую минуту проезжает на 500 м меньше, чем мотоциклист, поэтому на путь в 120 км он затрачивает времени на 2 часа больше, чем мотоциклист. Вычислите скорость велосипедиста.

Решение 2 (rus). №29 (с. 94)

Для решения задачи введем переменные и составим уравнение.

Пусть $v_в$ — скорость велосипедиста, а $v_м$ — скорость мотоциклиста. Расстояние $S = 120$ км.

Из условия известно, что велосипедист каждую минуту проезжает на 500 м меньше, чем мотоциклист. Выразим эту разницу в км/ч.

500 метров — это 0,5 км.1 минута — это $\frac{1}{60}$ часа.Следовательно, разница в скорости составляет 0,5 км за $\frac{1}{60}$ часа. Чтобы найти разницу в км/ч, нужно умножить расстояние на 60:

$v_м - v_в = 0.5 \text{ км} \times 60 = 30 \text{ км/ч}$

Отсюда скорость мотоциклиста: $v_м = v_в + 30$.

Время, которое велосипедист тратит на путь в 120 км, равно $t_в = \frac{S}{v_в} = \frac{120}{v_в}$.

Время, которое мотоциклист тратит на тот же путь, равно $t_м = \frac{S}{v_м} = \frac{120}{v_в + 30}$.

По условию, велосипедист затрачивает на 2 часа больше, чем мотоциклист, то есть $t_в - t_м = 2$. Составим и решим уравнение:

$\frac{120}{v_в} - \frac{120}{v_в + 30} = 2$

Приведем левую часть к общему знаменателю:

$\frac{120(v_в + 30) - 120v_в}{v_в(v_в + 30)} = 2$

Раскроем скобки в числителе:

$\frac{120v_в + 3600 - 120v_в}{v_в^2 + 30v_в} = 2$

$\frac{3600}{v_в^2 + 30v_в} = 2$

$3600 = 2(v_в^2 + 30v_в)$

Разделим обе части на 2:

$1800 = v_в^2 + 30v_в$

Получаем квадратное уравнение:

$v_в^2 + 30v_в - 1800 = 0$

Решим его через дискриминант:

$D = b^2 - 4ac = 30^2 - 4 \cdot 1 \cdot (-1800) = 900 + 7200 = 8100$

$\sqrt{D} = \sqrt{8100} = 90$

Найдем корни уравнения:

$(v_в)_1 = \frac{-30 + 90}{2 \cdot 1} = \frac{60}{2} = 30$

$(v_в)_2 = \frac{-30 - 90}{2 \cdot 1} = \frac{-120}{2} = -60$

Так как скорость не может быть отрицательной, корень -60 нам не подходит. Следовательно, скорость велосипедиста равна 30 км/ч.

Ответ: 30 км/ч.

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