Номер 510, страница 144 - 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

III. Последовательности. 20. Упражнения на повторение раздела «Последовательности» - номер 510, страница 144.

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                0 => App\Models\Book {#1105
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            "text" => "<p>1. Определение диапазона значений x</p><ul><li>Представим границы 10 и 20 в виде дробей со знаменателем 3: <br>$10 = \frac{30}{3}$, $20 = \frac{60}{3}$.</li><li>Следовательно, нас интересуют дроби $\frac{k}{3}$, где $30 &lt; k &lt; 60$.</li></ul><p>Ответ: Числители дробей находятся в диапазоне от 31 до 59 включительно.</p><p>2. Исключение сократимых дробей</p><ul><li>Дробь $\frac{k}{3}$ является сократимой только в том случае, если $k$ делится на 3 без остатка.</li><li>Выпишем все $k$ кратные 3 в нашем диапазоне: 33, 36, 39, 42, 45, 48, 51, 54, 57.</li><li>Эти числа соответствуют целым числам (11, 12, ..., 19), их мы исключаем.</li><li>Несократимые дроби будут иметь вид $\frac{31}{3}, \frac{32}{3}, \frac{34}{3}, \frac{35}{3}, \dots, \frac{58}{3}, \frac{59}{3}$.</li></ul><p>Ответ: Искомые дроби — это те, чей числитель не кратен 3.</p><p>3. Вычисление суммы</p><ul><li>Сначала найдем сумму всех дробей от $\frac{31}{3}$ до $\frac{59}{3}$: <br>$S_{all} = \frac{1}{3} \cdot (31 + 32 + 33 + \dots + 59)$.</li><li>Количество слагаемых $n = 59 - 31 + 1 = 29$. <br>Сумма арифметической прогрессии: $\frac{31+59}{2} \cdot 29 = 45 \cdot 29 = 1305$. <br>$S_{all} = \frac{1305}{3} = 435$.</li><li>Теперь найдем сумму сократимых дробей (целых чисел от 11 до 19): <br>$S_{int} = 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19$. <br>$S_{int} = \frac{11+19}{2} \cdot 9 = 15 \cdot 9 = 135$.</li><li>Искомая сумма: $S = S_{all} - S_{int} = 435 - 135 = 300$.</li></ul><p><strong>Ответ: 300.</strong></p>"
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            "text" => "<p>1. Определение диапазона значений x</p><ul><li>Представим границы 10 и 20 в виде дробей со знаменателем 3: <br>$10 = \frac{30}{3}$, $20 = \frac{60}{3}$.</li><li>Следовательно, нас интересуют дроби $\frac{k}{3}$, где $30 &lt; k &lt; 60$.</li></ul><p>Ответ: Числители дробей находятся в диапазоне от 31 до 59 включительно.</p><p>2. Исключение сократимых дробей</p><ul><li>Дробь $\frac{k}{3}$ является сократимой только в том случае, если $k$ делится на 3 без остатка.</li><li>Выпишем все $k$ кратные 3 в нашем диапазоне: 33, 36, 39, 42, 45, 48, 51, 54, 57.</li><li>Эти числа соответствуют целым числам (11, 12, ..., 19), их мы исключаем.</li><li>Несократимые дроби будут иметь вид $\frac{31}{3}, \frac{32}{3}, \frac{34}{3}, \frac{35}{3}, \dots, \frac{58}{3}, \frac{59}{3}$.</li></ul><p>Ответ: Искомые дроби — это те, чей числитель не кратен 3.</p><p>3. Вычисление суммы</p><ul><li>Сначала найдем сумму всех дробей от $\frac{31}{3}$ до $\frac{59}{3}$: <br>$S_{all} = \frac{1}{3} \cdot (31 + 32 + 33 + \dots + 59)$.</li><li>Количество слагаемых $n = 59 - 31 + 1 = 29$. <br>Сумма арифметической прогрессии: $\frac{31+59}{2} \cdot 29 = 45 \cdot 29 = 1305$. <br>$S_{all} = \frac{1305}{3} = 435$.</li><li>Теперь найдем сумму сократимых дробей (целых чисел от 11 до 19): <br>$S_{int} = 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19$. <br>$S_{int} = \frac{11+19}{2} \cdot 9 = 15 \cdot 9 = 135$.</li><li>Искомая сумма: $S = S_{all} - S_{int} = 435 - 135 = 300$.</li></ul><p><strong>Ответ: 300.</strong></p>"
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                    "field_display_title" => "507"
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                    "book" => Illuminate\Database\Eloquent\Collection {#1326 …2}
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                }
                2 => App\Models\Task {#1340
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№510 (с. 144)
Условие. №510 (с. 144)
скриншот условия
Алгебра, 9 класс Учебник, авторы: Солтан Генадий Николаевич, Солтан Алла Евгеньевна, Жумадилова Аманбала Жумадиловна, издательство Кокшетау, Алматы, 2019, страница 144, номер 510, Условие

510. Найдите сумму всех несократимых дробей $x$ со знаменателем 3, если $10 < x < 20$.

Решение. №510 (с. 144)
Алгебра, 9 класс Учебник, авторы: Солтан Генадий Николаевич, Солтан Алла Евгеньевна, Жумадилова Аманбала Жумадиловна, издательство Кокшетау, Алматы, 2019, страница 144, номер 510, Решение
Решение 2 (rus). №510 (с. 144)

1. Определение диапазона значений x

  • Представим границы 10 и 20 в виде дробей со знаменателем 3:
    $10 = \frac{30}{3}$, $20 = \frac{60}{3}$.
  • Следовательно, нас интересуют дроби $\frac{k}{3}$, где $30 < k < 60$.

Ответ: Числители дробей находятся в диапазоне от 31 до 59 включительно.

2. Исключение сократимых дробей

  • Дробь $\frac{k}{3}$ является сократимой только в том случае, если $k$ делится на 3 без остатка.
  • Выпишем все $k$ кратные 3 в нашем диапазоне: 33, 36, 39, 42, 45, 48, 51, 54, 57.
  • Эти числа соответствуют целым числам (11, 12, ..., 19), их мы исключаем.
  • Несократимые дроби будут иметь вид $\frac{31}{3}, \frac{32}{3}, \frac{34}{3}, \frac{35}{3}, \dots, \frac{58}{3}, \frac{59}{3}$.

Ответ: Искомые дроби — это те, чей числитель не кратен 3.

3. Вычисление суммы

  • Сначала найдем сумму всех дробей от $\frac{31}{3}$ до $\frac{59}{3}$:
    $S_{all} = \frac{1}{3} \cdot (31 + 32 + 33 + \dots + 59)$.
  • Количество слагаемых $n = 59 - 31 + 1 = 29$.
    Сумма арифметической прогрессии: $\frac{31+59}{2} \cdot 29 = 45 \cdot 29 = 1305$.
    $S_{all} = \frac{1305}{3} = 435$.
  • Теперь найдем сумму сократимых дробей (целых чисел от 11 до 19):
    $S_{int} = 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19$.
    $S_{int} = \frac{11+19}{2} \cdot 9 = 15 \cdot 9 = 135$.
  • Искомая сумма: $S = S_{all} - S_{int} = 435 - 135 = 300$.

Ответ: 300.

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