Номер 899, страница 250 - гдз по алгебре 9 класс учебник Солтан, Солтан

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

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

Тип: Учебник

Издательство: Кокшетау

Год издания: 2019 - 2026

ISBN: 978-601-317-424-2

Рекомендовано Министерством образования и науки Республики Казахстан

Повторение курса алгебры 7-9 классов. Числовые и алгебраические выражения и их преобразования - номер 899, страница 250.

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            "created_at" => "2026-04-10 13:58:26"
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                    "title" => "Решение 2 (rus)"
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            "text" => "<p>Чтобы число делилось на 6, оно должно одновременно делиться и на 2, и на 3. Рассмотрим оба условия для числа 379*.</p><p><strong>1.</strong> <strong>Признак делимости на 2.</strong><br>Число делится на 2, если его последняя цифра — чётная. Это означает, что вместо знака * может стоять одна из следующих цифр: 0, 2, 4, 6, 8.</p><p><strong>2.</strong> <strong>Признак делимости на 3.</strong><br>Число делится на 3, если сумма его цифр делится на 3. Найдем сумму известных цифр в числе 379*:<br>$3 + 7 + 9 = 19$.<br>Таким образом, сумма всех цифр числа равна $19 + *$. Эта сумма должна быть кратна 3.</p><p>Теперь объединим эти два условия. Будем подставлять вместо * только чётные цифры из первого пункта и проверять, выполняется ли условие делимости на 3.</p><p>• Если * = 0, то сумма цифр $19 + 0 = 19$. Число 19 не делится на 3.</p><p>• Если * = 2, то сумма цифр $19 + 2 = 21$. Число 21 делится на 3 ($21 : 3 = 7$). Следовательно, цифра 2 подходит.</p><p>• Если * = 4, то сумма цифр $19 + 4 = 23$. Число 23 не делится на 3.</p><p>• Если * = 6, то сумма цифр $19 + 6 = 25$. Число 25 не делится на 3.</p><p>• Если * = 8, то сумма цифр $19 + 8 = 27$. Число 27 делится на 3 ($27 : 3 = 9$). Следовательно, цифра 8 подходит.</p><p>Итак, подходящие цифры — это 2 и 8.</p><p><strong>Ответ:</strong> 2, 8.</p>"
          ]
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            "edition" => Illuminate\Database\Eloquent\Collection {#1116}
            "task" => array:2 [
              "refs" => "1108654"
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            "text" => "<p>Чтобы число делилось на 6, оно должно одновременно делиться и на 2, и на 3. Рассмотрим оба условия для числа 379*.</p><p><strong>1.</strong> <strong>Признак делимости на 2.</strong><br>Число делится на 2, если его последняя цифра — чётная. Это означает, что вместо знака * может стоять одна из следующих цифр: 0, 2, 4, 6, 8.</p><p><strong>2.</strong> <strong>Признак делимости на 3.</strong><br>Число делится на 3, если сумма его цифр делится на 3. Найдем сумму известных цифр в числе 379*:<br>$3 + 7 + 9 = 19$.<br>Таким образом, сумма всех цифр числа равна $19 + *$. Эта сумма должна быть кратна 3.</p><p>Теперь объединим эти два условия. Будем подставлять вместо * только чётные цифры из первого пункта и проверять, выполняется ли условие делимости на 3.</p><p>• Если * = 0, то сумма цифр $19 + 0 = 19$. Число 19 не делится на 3.</p><p>• Если * = 2, то сумма цифр $19 + 2 = 21$. Число 21 делится на 3 ($21 : 3 = 7$). Следовательно, цифра 2 подходит.</p><p>• Если * = 4, то сумма цифр $19 + 4 = 23$. Число 23 не делится на 3.</p><p>• Если * = 6, то сумма цифр $19 + 6 = 25$. Число 25 не делится на 3.</p><p>• Если * = 8, то сумма цифр $19 + 8 = 27$. Число 27 делится на 3 ($27 : 3 = 9$). Следовательно, цифра 8 подходит.</p><p>Итак, подходящие цифры — это 2 и 8.</p><p><strong>Ответ:</strong> 2, 8.</p>"
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            "field_author" => Illuminate\Database\Eloquent\Collection {#1131
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                  #connection: "mysql"
                  #table: "terms"
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                0 => App\Models\Term {#1137
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              #items: array:1 [
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                    "created_at" => "2026-04-10 13:58:26"
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            "field_city" => Illuminate\Database\Eloquent\Collection {#1140
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                1 => App\Models\Task {#2509
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                2 => App\Models\Task {#2524
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                3 => App\Models\Task {#2566
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                4 => App\Models\Task {#2581
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№899 (с. 250)
Условие. №899 (с. 250)
скриншот условия
Алгебра, 9 класс Учебник, авторы: Солтан Генадий Николаевич, Солтан Алла Евгеньевна, Жумадилова Аманбала Жумадиловна, издательство Кокшетау, Алматы, 2019, страница 250, номер 899, Условие

899. Укажите все цифры, которые можно поставить вместо знака *, чтобы четырехзначное число 379* делилось на 6.

Решение. №899 (с. 250)
Алгебра, 9 класс Учебник, авторы: Солтан Генадий Николаевич, Солтан Алла Евгеньевна, Жумадилова Аманбала Жумадиловна, издательство Кокшетау, Алматы, 2019, страница 250, номер 899, Решение
Решение 2 (rus). №899 (с. 250)

Чтобы число делилось на 6, оно должно одновременно делиться и на 2, и на 3. Рассмотрим оба условия для числа 379*.

1. Признак делимости на 2.
Число делится на 2, если его последняя цифра — чётная. Это означает, что вместо знака * может стоять одна из следующих цифр: 0, 2, 4, 6, 8.

2. Признак делимости на 3.
Число делится на 3, если сумма его цифр делится на 3. Найдем сумму известных цифр в числе 379*:
$3 + 7 + 9 = 19$.
Таким образом, сумма всех цифр числа равна $19 + *$. Эта сумма должна быть кратна 3.

Теперь объединим эти два условия. Будем подставлять вместо * только чётные цифры из первого пункта и проверять, выполняется ли условие делимости на 3.

• Если * = 0, то сумма цифр $19 + 0 = 19$. Число 19 не делится на 3.

• Если * = 2, то сумма цифр $19 + 2 = 21$. Число 21 делится на 3 ($21 : 3 = 7$). Следовательно, цифра 2 подходит.

• Если * = 4, то сумма цифр $19 + 4 = 23$. Число 23 не делится на 3.

• Если * = 6, то сумма цифр $19 + 6 = 25$. Число 25 не делится на 3.

• Если * = 8, то сумма цифр $19 + 8 = 27$. Число 27 делится на 3 ($27 : 3 = 9$). Следовательно, цифра 8 подходит.

Итак, подходящие цифры — это 2 и 8.

Ответ: 2, 8.

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