Номер 858, страница 237 - гдз по алгебре 9 класс учебник Солтан, Солтан

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

Авторы: Солтан Г. Н., Солтан А. Е., Жумадилова А. Ж.

Тип: Учебник

Издательство: Кокшетау

Год издания: 2019 - 2026

ISBN: 978-601-317-424-2

Рекомендовано Министерством образования и науки Республики Казахстан

V. Элементы теории вероятностей. 32. Статистическая вероятность - номер 858, страница 237.

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            "text" => "<p><strong>858.</strong> Сведения о заработной плате сотрудников одного предприятия представлены в таблице. Какова вероятность того, что зарплата случайно выбранного сотрудника больше 500, но не больше 600 у. д. е.?</p><table><tbody><tr><td style="border:2px solid hsl(0, 0%, 0%);"><strong>Классы заработной платы (в у. д. е.):</strong></td><td style="border:2px solid hsl(0, 0%, 0%);">[200; 300]</td><td style="border:2px solid hsl(0, 0%, 0%);">(300; 400]</td><td style="border:2px solid hsl(0, 0%, 0%);">(400; 500]</td><td style="border:2px solid hsl(0, 0%, 0%);">(500; 600]</td><td style="border:2px solid hsl(0, 0%, 0%);">(600; 700]</td><td style="border:2px solid hsl(0, 0%, 0%);">(700; 800]</td><td style="border:2px solid hsl(0, 0%, 0%);">(800; 900]</td></tr><tr><td style="border:2px solid hsl(0, 0%, 0%);"><strong>Количество сотрудников:</strong></td><td style="border:2px solid hsl(0, 0%, 0%);">54</td><td style="border:2px solid hsl(0, 0%, 0%);">145</td><td style="border:2px solid hsl(0, 0%, 0%);">310</td><td style="border:2px solid hsl(0, 0%, 0%);">128</td><td style="border:2px solid hsl(0, 0%, 0%);">79</td><td style="border:2px solid hsl(0, 0%, 0%);">46</td><td style="border:2px solid hsl(0, 0%, 0%);">15</td></tr></tbody></table>"
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            "text" => "<p><strong>858.</strong> Сведения о заработной плате сотрудников одного предприятия представлены в таблице. Какова вероятность того, что зарплата случайно выбранного сотрудника больше 500, но не больше 600 у. д. е.?</p><table><tbody><tr><td style="border:2px solid hsl(0, 0%, 0%);"><strong>Классы заработной платы (в у. д. е.):</strong></td><td style="border:2px solid hsl(0, 0%, 0%);">[200; 300]</td><td style="border:2px solid hsl(0, 0%, 0%);">(300; 400]</td><td style="border:2px solid hsl(0, 0%, 0%);">(400; 500]</td><td style="border:2px solid hsl(0, 0%, 0%);">(500; 600]</td><td style="border:2px solid hsl(0, 0%, 0%);">(600; 700]</td><td style="border:2px solid hsl(0, 0%, 0%);">(700; 800]</td><td style="border:2px solid hsl(0, 0%, 0%);">(800; 900]</td></tr><tr><td style="border:2px solid hsl(0, 0%, 0%);"><strong>Количество сотрудников:</strong></td><td style="border:2px solid hsl(0, 0%, 0%);">54</td><td style="border:2px solid hsl(0, 0%, 0%);">145</td><td style="border:2px solid hsl(0, 0%, 0%);">310</td><td style="border:2px solid hsl(0, 0%, 0%);">128</td><td style="border:2px solid hsl(0, 0%, 0%);">79</td><td style="border:2px solid hsl(0, 0%, 0%);">46</td><td style="border:2px solid hsl(0, 0%, 0%);">15</td></tr></tbody></table>"
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            "text" => "<p>Для нахождения вероятности того, что зарплата случайно выбранного сотрудника находится в определённом диапазоне, мы будем использовать классическое определение вероятности. Вероятность события $P$ вычисляется по формуле:<br>$P = \frac{m}{n}$<br>где $m$ — это число благоприятных исходов (сотрудников, чья зарплата удовлетворяет условию), а $n$ — это общее число возможных исходов (общее количество сотрудников).</p><p><strong>Нахождение числа благоприятных исходов (m)</strong><br>Нам нужно найти вероятность того, что зарплата сотрудника больше 500, но не больше 600 условных денежных единиц. Это соответствует зарплатному классу $(500; 600]$. Согласно данным из таблицы, количество сотрудников в этом классе составляет 128 человек.<br>Следовательно, число благоприятных исходов: $m = 128$.</p><p><strong>Нахождение общего числа исходов (n)</strong><br>Общее число исходов равно общему количеству сотрудников на предприятии. Для этого необходимо просуммировать количество сотрудников во всех зарплатных классах:<br>$n = 54 + 145 + 310 + 128 + 79 + 46 + 15$<br>$n = 777$<br>Таким образом, общее количество сотрудников на предприятии составляет 777 человек.</p><p><strong>Вычисление вероятности</strong><br>Теперь мы можем подставить найденные значения $m$ и $n$ в формулу вероятности:<br>$P = \frac{m}{n} = \frac{128}{777}$<br>Дробь $\frac{128}{777}$ является несократимой, так как числитель $128 = 2^7$, а знаменатель $777 = 3 \times 7 \times 37$, и у них нет общих простых делителей.</p><p><strong>Ответ:</strong> $\frac{128}{777}$</p>"
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            "task" => array:2 [
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            "text" => "<p>Для нахождения вероятности того, что зарплата случайно выбранного сотрудника находится в определённом диапазоне, мы будем использовать классическое определение вероятности. Вероятность события $P$ вычисляется по формуле:<br>$P = \frac{m}{n}$<br>где $m$ — это число благоприятных исходов (сотрудников, чья зарплата удовлетворяет условию), а $n$ — это общее число возможных исходов (общее количество сотрудников).</p><p><strong>Нахождение числа благоприятных исходов (m)</strong><br>Нам нужно найти вероятность того, что зарплата сотрудника больше 500, но не больше 600 условных денежных единиц. Это соответствует зарплатному классу $(500; 600]$. Согласно данным из таблицы, количество сотрудников в этом классе составляет 128 человек.<br>Следовательно, число благоприятных исходов: $m = 128$.</p><p><strong>Нахождение общего числа исходов (n)</strong><br>Общее число исходов равно общему количеству сотрудников на предприятии. Для этого необходимо просуммировать количество сотрудников во всех зарплатных классах:<br>$n = 54 + 145 + 310 + 128 + 79 + 46 + 15$<br>$n = 777$<br>Таким образом, общее количество сотрудников на предприятии составляет 777 человек.</p><p><strong>Вычисление вероятности</strong><br>Теперь мы можем подставить найденные значения $m$ и $n$ в формулу вероятности:<br>$P = \frac{m}{n} = \frac{128}{777}$<br>Дробь $\frac{128}{777}$ является несократимой, так как числитель $128 = 2^7$, а знаменатель $777 = 3 \times 7 \times 37$, и у них нет общих простых делителей.</p><p><strong>Ответ:</strong> $\frac{128}{777}$</p>"
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                  #appends: []
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                  #touches: []
                  +timestamps: true
                  +usesUniqueIds: false
                  #hidden: []
                  #visible: []
                  #fillable: []
                  #guarded: array:1 [
                    0 => "*"
                  ]
                }
                1 => 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:12 [
                    "id" => 7004
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "name" => "Солтан"
                    "field_bio" => null
                    "field_degree_rp" => null
                    "field_foreign_lang_name" => null
                    "field_foreign_lang_patronymic" => null
                    "field_foreign_lang_surname" => null
                    "field_name" => "Алла"
                    "field_patronymic" => "Евгеньевна"
                    "field_surname_rp" => null
                  ]
                  #original: array:12 [
                    "id" => 7004
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "name" => "Солтан"
                    "field_bio" => null
                    "field_degree_rp" => null
                    "field_foreign_lang_name" => null
                    "field_foreign_lang_patronymic" => null
                    "field_foreign_lang_surname" => null
                    "field_name" => "Алла"
                    "field_patronymic" => "Евгеньевна"
                    "field_surname_rp" => null
                  ]
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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 => "*"
                  ]
                }
                2 => App\Models\Term {#1147
                  #connection: "mysql"
                  #table: "terms"
                  #primaryKey: "id"
                  #keyType: "int"
                  +incrementing: false
                  #with: []
                  #withCount: []
                  +preventsLazyLoading: false
                  #perPage: 15
                  +exists: true
                  +wasRecentlyCreated: false
                  #escapeWhenCastingToString: false
                  #attributes: array:12 [
                    "id" => 7005
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "name" => "Жумадилова"
                    "field_bio" => null
                    "field_degree_rp" => null
                    "field_foreign_lang_name" => null
                    "field_foreign_lang_patronymic" => null
                    "field_foreign_lang_surname" => null
                    "field_name" => "Аманбала"
                    "field_patronymic" => "Жумадиловна"
                    "field_surname_rp" => null
                  ]
                  #original: array:12 [
                    "id" => 7005
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "name" => "Жумадилова"
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                    "field_degree_rp" => null
                    "field_foreign_lang_name" => null
                    "field_foreign_lang_patronymic" => null
                    "field_foreign_lang_surname" => null
                    "field_name" => "Аманбала"
                    "field_patronymic" => "Жумадиловна"
                    "field_surname_rp" => null
                  ]
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                  #attributeCastCache: []
                  #dateFormat: null
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                  #visible: []
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                    0 => "*"
                  ]
                }
              ]
              #escapeWhenCastingToString: false
            }
            "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1154
              #items: []
              #escapeWhenCastingToString: false
            }
            "field_book_type" => Illuminate\Database\Eloquent\Collection {#1156
              #items: array:1 [
                0 => App\Models\Term {#1152
                  #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"
                  ]
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                    "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
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                    "field_short_name_foreign" => null
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                  ]
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                    0 => "*"
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                }
              ]
              #escapeWhenCastingToString: false
            }
            "field_country" => Illuminate\Database\Eloquent\Collection {#1150
              #items: array:1 [
                0 => App\Models\Term {#1153
                  #connection: "mysql"
                  #table: "terms"
                  #primaryKey: "id"
                  #keyType: "int"
                  +incrementing: false
                  #with: []
                  #withCount: []
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                  #perPage: 15
                  +exists: true
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                  #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"
                  ]
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                    "id" => 6994
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "name" => "Казахстан"
                    "field_cases" => array:6 [ …6]
                    "field_translit" => "kazakhstan"
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                    0 => "*"
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                }
              ]
              #escapeWhenCastingToString: false
            }
            "field_city" => Illuminate\Database\Eloquent\Collection {#1151
              #items: array:1 [
                0 => App\Models\Term {#1181
                  #connection: "mysql"
                  #table: "terms"
                  #primaryKey: "id"
                  #keyType: "int"
                  +incrementing: false
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                  #withCount: []
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                  #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"
                  ]
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                    "id" => 6995
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "name" => "Алматы"
                    "field_cases" => array:6 [ …6]
                    "field_translit" => "almaty"
                  ]
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                  #attributeCastCache: []
                  #dateFormat: null
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                    0 => "*"
                  ]
                }
              ]
              #escapeWhenCastingToString: false
            }
            "field_series" => Illuminate\Database\Eloquent\Collection {#1182
              #items: []
              #escapeWhenCastingToString: false
            }
            "field_umk" => Illuminate\Database\Eloquent\Collection {#1184
              #items: []
              #escapeWhenCastingToString: false
            }
            "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1185
              #items: []
              #escapeWhenCastingToString: false
            }
            "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1186
              #items: []
              #escapeWhenCastingToString: false
            }
            "field_publication_number" => null
            "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1187
              #items: []
              #escapeWhenCastingToString: false
            }
            "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1188
              #items: []
              #escapeWhenCastingToString: false
            }
            "field_under_the_edition_degree" => null
            "field_cover_description" => null
            "field_publication_year" => "2019"
            "field_publication_year_until" => null
            "field_part" => ""
            "field_part_writing" => ""
            "field_second_foreign_language" => null
            "field_for_whom" => "Учебник для учащихся 9 класса общеобразовательных школ"
            "field_allowed" => "Рекомендовано Министерством образования и науки Республики Казахстан"
            "field_reserve_field" => null
            "field_link_to_source" => null
            "field_tasks_count" => "1291"
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            "field_default_folder" => "/algebra_09/soltan-u19/"
            "field_isbn" => "978-601-317-424-2"
            "field_cover" => array:1 [
              0 => "/media/algebra_09/soltan-u19/covers/cover1.webp?ts=1752140452"
            ]
            "field_cover_alts" => array:1 [
              0 => ""
            ]
            "field_covers" => array:1 [
              0 => array:4 [
                "path" => "/media/algebra_09/soltan-u19/covers/cover1.webp?ts=1752140452"
                "alt" => ""
                "width" => "1940"
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              ]
            ]
            "field_popular_book" => null
            "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1189
              #items: []
              #escapeWhenCastingToString: false
            }
            "field_new_book" => Illuminate\Database\Eloquent\Collection {#1190
              #items: []
              #escapeWhenCastingToString: false
            }
            "field_old_book" => Illuminate\Database\Eloquent\Collection {#1191
              #items: []
              #escapeWhenCastingToString: false
            }
            "field_url" => "/9-klass/algebra/kokshetau-soltan-uchebnik"
            "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1192
              #items: []
              #escapeWhenCastingToString: false
            }
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            "breadcrumbs" => array:3 [
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            ]
          ]
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            "id" => 4298
            "created_at" => "2026-04-10 13:58:26"
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            "field_subject" => Illuminate\Database\Eloquent\Collection {#1141}
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            "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1154}
            "field_book_type" => Illuminate\Database\Eloquent\Collection {#1156}
            "field_country" => Illuminate\Database\Eloquent\Collection {#1150}
            "field_city" => Illuminate\Database\Eloquent\Collection {#1151}
            "field_series" => Illuminate\Database\Eloquent\Collection {#1182}
            "field_umk" => Illuminate\Database\Eloquent\Collection {#1184}
            "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1185}
            "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1186}
            "field_publication_number" => null
            "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1187}
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            "field_cover_description" => null
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            "field_part" => ""
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            "field_for_whom" => "Учебник для учащихся 9 класса общеобразовательных школ"
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              0 => "/media/algebra_09/soltan-u19/covers/cover1.webp?ts=1752140452"
            ]
            "field_cover_alts" => array:1 [
              0 => ""
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            "field_recommended_books" => Illuminate\Database\Eloquent\Collection {#1189}
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            "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1192}
            "field_metatags_title" => null
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            "breadcrumbs" => array:3 [
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          ]
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            0 => "*"
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        }
      ]
      #escapeWhenCastingToString: false
    }
    "page" => Illuminate\Database\Eloquent\Collection {#1200
      #items: array:1 [
        0 => App\Models\BookPage {#1199
          #connection: "mysql"
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          #primaryKey: "id"
          #keyType: "int"
          +incrementing: true
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          #attributes: array:21 [
            "id" => 1097979
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "field_page_start" => "237"
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            "field_display_title" => "237"
            "field_folder" => "folder1"
            "field_image_name" => "237"
            "field_branch_parent" => Illuminate\Database\Eloquent\Collection {#1201
              #items: []
              #escapeWhenCastingToString: false
            }
            "field_weight" => "0"
            "field_book_parent" => Illuminate\Database\Eloquent\Collection {#1202
              #items: array:1 [
                0 => App\Models\Book {#1155}
              ]
              #escapeWhenCastingToString: false
            }
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            "edition_groups" => Illuminate\Database\Eloquent\Collection {#1203
              #items: []
              #escapeWhenCastingToString: false
            }
            "content" => Illuminate\Database\Eloquent\Collection {#1213
              #items: array:1 [
                0 => App\Models\Element {#1212
                  #connection: "mysql"
                  #table: "elements"
                  #primaryKey: "id"
                  #keyType: "int"
                  +incrementing: true
                  #with: []
                  #withCount: []
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                  #perPage: 15
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                  #escapeWhenCastingToString: false
                  #attributes: array:6 [
                    "id" => 1261130
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "edition" => Illuminate\Database\Eloquent\Collection {#1214 …2}
                    "book_page" => array:2 [ …2]
                    "img" => array:1 [ …1]
                  ]
                  #original: array:6 [
                    "id" => 1261130
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "edition" => Illuminate\Database\Eloquent\Collection {#1214 …2}
                    "book_page" => array:2 [ …2]
                    "img" => array:1 [ …1]
                  ]
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                    0 => "*"
                  ]
                }
              ]
              #escapeWhenCastingToString: false
            }
            "next" => array:2 [
              "refs" => "1097980"
              "type" => "book_page"
            ]
            "previous" => array:2 [
              "refs" => "1097978"
              "type" => "book_page"
            ]
            "tasks" => Illuminate\Database\Eloquent\Collection {#1369
              #items: array:5 [
                0 => App\Models\Task {#1381
                  #connection: "mysql"
                  #table: "tasks"
                  #primaryKey: "id"
                  #keyType: "int"
                  +incrementing: true
                  #with: []
                  #withCount: []
                  +preventsLazyLoading: false
                  #perPage: 15
                  +exists: true
                  +wasRecentlyCreated: false
                  #escapeWhenCastingToString: false
                  #attributes: array:24 [
                    "id" => 1108603
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "field_page_start" => "237"
                    "field_page_end" => null
                    "field_url" => "/9-klass/algebra/kokshetau-soltan-uchebnik/vopr-237"
                    "field_display_title" => "Вопросы"
                    "field_outside_task" => null
                    "field_task_type" => Illuminate\Database\Eloquent\Collection {#1382 …2}
                    "field_metatags_title" => null
                    "field_metatags_description" => null
                    "field_h1" => null
                    "field_description_top" => null
                    "field_description_bottom" => null
                    "field_match" => null
                    "breadcrumbs" => []
                    "edition_groups" => Illuminate\Database\Eloquent\Collection {#1383 …2}
                    "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1384 …2}
                    "parent_branches" => Illuminate\Database\Eloquent\Collection {#1385 …2}
                    "content" => Illuminate\Database\Eloquent\Collection {#1395 …2}
                    "next" => array:2 [ …2]
                    "previous" => array:2 [ …2]
                    "book" => Illuminate\Database\Eloquent\Collection {#1402 …2}
                    "page" => array:2 [ …2]
                  ]
                  #original: array:24 [
                    "id" => 1108603
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "field_page_start" => "237"
                    "field_page_end" => null
                    "field_url" => "/9-klass/algebra/kokshetau-soltan-uchebnik/vopr-237"
                    "field_display_title" => "Вопросы"
                    "field_outside_task" => null
                    "field_task_type" => Illuminate\Database\Eloquent\Collection {#1382 …2}
                    "field_metatags_title" => null
                    "field_metatags_description" => null
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                    "edition_groups" => Illuminate\Database\Eloquent\Collection {#1383 …2}
                    "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1384 …2}
                    "parent_branches" => Illuminate\Database\Eloquent\Collection {#1385 …2}
                    "content" => Illuminate\Database\Eloquent\Collection {#1395 …2}
                    "next" => array:2 [ …2]
                    "previous" => array:2 [ …2]
                    "book" => Illuminate\Database\Eloquent\Collection {#1402 …2}
                    "page" => array:2 [ …2]
                  ]
                  #changes: []
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                  #attributeCastCache: []
                  #dateFormat: null
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                  #touches: []
                  +timestamps: true
                  +usesUniqueIds: false
                  #hidden: []
                  #visible: []
                  #fillable: []
                  #guarded: array:1 [
                    0 => "*"
                  ]
                }
                1 => App\Models\Task {#1386
                  #connection: "mysql"
                  #table: "tasks"
                  #primaryKey: "id"
                  #keyType: "int"
                  +incrementing: true
                  #with: []
                  #withCount: []
                  +preventsLazyLoading: false
                  #perPage: 15
                  +exists: true
                  +wasRecentlyCreated: false
                  #escapeWhenCastingToString: false
                  #attributes: array:24 [
                    "id" => 1108604
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "field_page_start" => "237"
                    "field_page_end" => null
                    "field_url" => "/9-klass/algebra/kokshetau-soltan-uchebnik/1-855"
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№858 (с. 237)
Условие. №858 (с. 237)
скриншот условия
Алгебра, 9 класс Учебник, авторы: Солтан Генадий Николаевич, Солтан Алла Евгеньевна, Жумадилова Аманбала Жумадиловна, издательство Кокшетау, Алматы, 2019, страница 237, номер 858, Условие

858. Сведения о заработной плате сотрудников одного предприятия представлены в таблице. Какова вероятность того, что зарплата случайно выбранного сотрудника больше 500, но не больше 600 у. д. е.?

Классы заработной платы (в у. д. е.):[200; 300](300; 400](400; 500](500; 600](600; 700](700; 800](800; 900]
Количество сотрудников:54145310128794615
Решение. №858 (с. 237)
Алгебра, 9 класс Учебник, авторы: Солтан Генадий Николаевич, Солтан Алла Евгеньевна, Жумадилова Аманбала Жумадиловна, издательство Кокшетау, Алматы, 2019, страница 237, номер 858, Решение
Решение 2 (rus). №858 (с. 237)

Для нахождения вероятности того, что зарплата случайно выбранного сотрудника находится в определённом диапазоне, мы будем использовать классическое определение вероятности. Вероятность события $P$ вычисляется по формуле:
$P = \frac{m}{n}$
где $m$ — это число благоприятных исходов (сотрудников, чья зарплата удовлетворяет условию), а $n$ — это общее число возможных исходов (общее количество сотрудников).

Нахождение числа благоприятных исходов (m)
Нам нужно найти вероятность того, что зарплата сотрудника больше 500, но не больше 600 условных денежных единиц. Это соответствует зарплатному классу $(500; 600]$. Согласно данным из таблицы, количество сотрудников в этом классе составляет 128 человек.
Следовательно, число благоприятных исходов: $m = 128$.

Нахождение общего числа исходов (n)
Общее число исходов равно общему количеству сотрудников на предприятии. Для этого необходимо просуммировать количество сотрудников во всех зарплатных классах:
$n = 54 + 145 + 310 + 128 + 79 + 46 + 15$
$n = 777$
Таким образом, общее количество сотрудников на предприятии составляет 777 человек.

Вычисление вероятности
Теперь мы можем подставить найденные значения $m$ и $n$ в формулу вероятности:
$P = \frac{m}{n} = \frac{128}{777}$
Дробь $\frac{128}{777}$ является несократимой, так как числитель $128 = 2^7$, а знаменатель $777 = 3 \times 7 \times 37$, и у них нет общих простых делителей.

Ответ: $\frac{128}{777}$

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