Занимательные задачи 2, страница 100 - 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. 13. Числовая последовательность, способы ее задания и свойства - страница 100.

App\Models\Task {#1024 // resources/views/models/task/default.blade.php
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            "text" => "<p><strong>а)</strong> Вычислим значение выражения по действиям. Сначала преобразуем многоэтажную дробь.</p><p><strong>1.</strong> Начнем с самого нижнего знаменателя: $2 + \frac{1}{2}$.</p><p>$2 + \frac{1}{2} = \frac{4}{2} + \frac{1}{2} = \frac{5}{2}$</p><p><strong>2.</strong> Подставим полученное значение в следующий знаменатель: $2 + \frac{1}{2 + \frac{1}{2}}$.</p><p>$2 + \frac{1}{\frac{5}{2}} = 2 + \frac{2}{5} = \frac{10}{5} + \frac{2}{5} = \frac{12}{5}$</p><p><strong>3.</strong> Теперь вычислим значение всей первой дроби:</p><p>$\frac{1}{2 + \frac{1}{2 + \frac{1}{2}}} = \frac{1}{\frac{12}{5}} = \frac{5}{12}$</p><p><strong>4.</strong> Теперь упростим вторую дробь $\frac{1717}{2424}$. Заметим, что числитель и знаменатель можно сократить на 101:</p><p>$\frac{1717}{2424} = \frac{17 \times 101}{24 \times 101} = \frac{17}{24}$</p><p><strong>5.</strong> Выполним вычитание, приведя дроби к общему знаменателю 24:</p><p>$\frac{5}{12} - \frac{17}{24} = \frac{5 \times 2}{12 \times 2} - \frac{17}{24} = \frac{10}{24} - \frac{17}{24} = \frac{10 - 17}{24} = -\frac{7}{24}$</p><p><strong>Ответ:</strong> $-\frac{7}{24}$</p><br><p><strong>б)</strong> Для вычисления выражения $\sqrt{\sqrt{\sqrt{390625}}}$ можно пойти двумя путями.</p><p><em>Способ 1: Использование свойства корней.</em></p><p>Свойство вложенных корней гласит: $\sqrt[n]{\sqrt[m]{a}} = \sqrt[n \cdot m]{a}$. Три вложенных квадратных корня (корень 2-й степени) эквивалентны корню степени $2 \times 2 \times 2 = 8$.</p><p>$\sqrt{\sqrt{\sqrt{390625}}} = \sqrt[8]{390625}$</p><p>Число 390625 оканчивается на 5, поэтому можно предположить, что это степень числа 5. Проверим:</p><p>$5^4 = 625$</p><p>$5^8 = (5^4)^2 = 625^2 = 390625$</p><p>Значит, $\sqrt[8]{390625} = \sqrt[8]{5^8} = 5$.</p><p><em>Способ 2: Последовательное извлечение корней.</em></p><p><strong>1.</strong> Сначала извлечем корень из 390625. Так как $600^2 = 360000$ и $630^2 = 396900$, а число оканчивается на 5, искомый корень — 625. Проверка: $625 \times 625 = 390625$.</p><p>Теперь выражение выглядит так: $\sqrt{\sqrt{625}}$.</p><p><strong>2.</strong> Далее извлечем корень из 625. Это известный квадрат числа 25.</p><p>$\sqrt{625} = 25$</p><p>Остается вычислить: $\sqrt{25}$.</p><p><strong>3.</strong> $\sqrt{25} = 5$.</p><p>Оба способа приводят к одному и тому же результату.</p><p><strong>Ответ:</strong> $5$</p>"
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Занимательные задачи 2 (с. 100)
Условие. Занимательные задачи 2 (с. 100)
скриншот условия
Алгебра, 9 класс Учебник, авторы: Солтан Генадий Николаевич, Солтан Алла Евгеньевна, Жумадилова Аманбала Жумадиловна, издательство Кокшетау, Алматы, 2019, страница 100, Условие

2) Известно, что $a + \frac{1}{a} = 5$. Запишите последовательность чисел, являющихся значениями выражений: $a^2 + \frac{1}{a^2}$; $a^3 + \frac{1}{a^3}$; $a^4 + \frac{1}{a^4}$.

Решение. Занимательные задачи 2 (с. 100)
Алгебра, 9 класс Учебник, авторы: Солтан Генадий Николаевич, Солтан Алла Евгеньевна, Жумадилова Аманбала Жумадиловна, издательство Кокшетау, Алматы, 2019, страница 100, Решение
Решение 2 (rus). Занимательные задачи 2 (с. 100)

а) Вычислим значение выражения по действиям. Сначала преобразуем многоэтажную дробь.

1. Начнем с самого нижнего знаменателя: $2 + \frac{1}{2}$.

$2 + \frac{1}{2} = \frac{4}{2} + \frac{1}{2} = \frac{5}{2}$

2. Подставим полученное значение в следующий знаменатель: $2 + \frac{1}{2 + \frac{1}{2}}$.

$2 + \frac{1}{\frac{5}{2}} = 2 + \frac{2}{5} = \frac{10}{5} + \frac{2}{5} = \frac{12}{5}$

3. Теперь вычислим значение всей первой дроби:

$\frac{1}{2 + \frac{1}{2 + \frac{1}{2}}} = \frac{1}{\frac{12}{5}} = \frac{5}{12}$

4. Теперь упростим вторую дробь $\frac{1717}{2424}$. Заметим, что числитель и знаменатель можно сократить на 101:

$\frac{1717}{2424} = \frac{17 \times 101}{24 \times 101} = \frac{17}{24}$

5. Выполним вычитание, приведя дроби к общему знаменателю 24:

$\frac{5}{12} - \frac{17}{24} = \frac{5 \times 2}{12 \times 2} - \frac{17}{24} = \frac{10}{24} - \frac{17}{24} = \frac{10 - 17}{24} = -\frac{7}{24}$

Ответ: $-\frac{7}{24}$


б) Для вычисления выражения $\sqrt{\sqrt{\sqrt{390625}}}$ можно пойти двумя путями.

Способ 1: Использование свойства корней.

Свойство вложенных корней гласит: $\sqrt[n]{\sqrt[m]{a}} = \sqrt[n \cdot m]{a}$. Три вложенных квадратных корня (корень 2-й степени) эквивалентны корню степени $2 \times 2 \times 2 = 8$.

$\sqrt{\sqrt{\sqrt{390625}}} = \sqrt[8]{390625}$

Число 390625 оканчивается на 5, поэтому можно предположить, что это степень числа 5. Проверим:

$5^4 = 625$

$5^8 = (5^4)^2 = 625^2 = 390625$

Значит, $\sqrt[8]{390625} = \sqrt[8]{5^8} = 5$.

Способ 2: Последовательное извлечение корней.

1. Сначала извлечем корень из 390625. Так как $600^2 = 360000$ и $630^2 = 396900$, а число оканчивается на 5, искомый корень — 625. Проверка: $625 \times 625 = 390625$.

Теперь выражение выглядит так: $\sqrt{\sqrt{625}}$.

2. Далее извлечем корень из 625. Это известный квадрат числа 25.

$\sqrt{625} = 25$

Остается вычислить: $\sqrt{25}$.

3. $\sqrt{25} = 5$.

Оба способа приводят к одному и тому же результату.

Ответ: $5$

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