Номер 4, страница 11 - 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 8 класса. Упражнения - номер 4, страница 11.

App\Models\Task {#1024 // resources/views/models/task/default.blade.php
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            "text" => "<p><strong>а)</strong> Для упрощения выражения $(4 + \sqrt{a})(4 - \sqrt{a})$ используется формула сокращенного умножения "разность квадратов": $(x+y)(x-y) = x^2 - y^2$. В данном случае $x=4$ и $y=\sqrt{a}$.</p><p>Применяя формулу, получаем:</p><p>$(4 + \sqrt{a})(4 - \sqrt{a}) = 4^2 - (\sqrt{a})^2 = 16 - a$.</p><p><strong>Ответ:</strong> $16 - a$.</p><p><strong>б)</strong> Выражение $(\sqrt{b} + \sqrt{c})(\sqrt{b} - \sqrt{c})$ также упрощается с помощью формулы разности квадратов. Здесь $x=\sqrt{b}$ и $y=\sqrt{c}$.</p><p>Применяя формулу, получаем:</p><p>$(\sqrt{b} + \sqrt{c})(\sqrt{b} - \sqrt{c}) = (\sqrt{b})^2 - (\sqrt{c})^2 = b - c$.</p><p><strong>Ответ:</strong> $b - c$.</p><p><strong>в)</strong> В выражении $(\sqrt{m} + \sqrt{5})^2 - (m + 5)$ сначала раскроем квадрат суммы по формуле $(x+y)^2 = x^2 + 2xy + y^2$.</p><p>$(\sqrt{m} + \sqrt{5})^2 = (\sqrt{m})^2 + 2 \cdot \sqrt{m} \cdot \sqrt{5} + (\sqrt{5})^2 = m + 2\sqrt{5m} + 5$.</p><p>Теперь подставим полученное выражение в исходное:</p><p>$(m + 2\sqrt{5m} + 5) - (m + 5) = m + 2\sqrt{5m} + 5 - m - 5$.</p><p>Приводим подобные слагаемые:</p><p>$(m-m) + (5-5) + 2\sqrt{5m} = 0 + 0 + 2\sqrt{5m} = 2\sqrt{5m}$.</p><p><strong>Ответ:</strong> $2\sqrt{5m}$.</p><p><strong>г)</strong> В выражении $(n + 10) - (\sqrt{10} - \sqrt{n})^2$ сначала раскроем квадрат разности по формуле $(x-y)^2 = x^2 - 2xy + y^2$.</p><p>$(\sqrt{10} - \sqrt{n})^2 = (\sqrt{10})^2 - 2 \cdot \sqrt{10} \cdot \sqrt{n} + (\sqrt{n})^2 = 10 - 2\sqrt{10n} + n$.</p><p>Теперь подставим полученное выражение в исходное и раскроем скобки (знаки внутри скобок меняются на противоположные):</p><p>$(n + 10) - (10 - 2\sqrt{10n} + n) = n + 10 - 10 + 2\sqrt{10n} - n$.</p><p>Приводим подобные слагаемые:</p><p>$(n-n) + (10-10) + 2\sqrt{10n} = 0 + 0 + 2\sqrt{10n} = 2\sqrt{10n}$.</p><p><strong>Ответ:</strong> $2\sqrt{10n}$.</p>"
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            "text" => "<p><strong>а)</strong> Для упрощения выражения $(4 + \sqrt{a})(4 - \sqrt{a})$ используется формула сокращенного умножения "разность квадратов": $(x+y)(x-y) = x^2 - y^2$. В данном случае $x=4$ и $y=\sqrt{a}$.</p><p>Применяя формулу, получаем:</p><p>$(4 + \sqrt{a})(4 - \sqrt{a}) = 4^2 - (\sqrt{a})^2 = 16 - a$.</p><p><strong>Ответ:</strong> $16 - a$.</p><p><strong>б)</strong> Выражение $(\sqrt{b} + \sqrt{c})(\sqrt{b} - \sqrt{c})$ также упрощается с помощью формулы разности квадратов. Здесь $x=\sqrt{b}$ и $y=\sqrt{c}$.</p><p>Применяя формулу, получаем:</p><p>$(\sqrt{b} + \sqrt{c})(\sqrt{b} - \sqrt{c}) = (\sqrt{b})^2 - (\sqrt{c})^2 = b - c$.</p><p><strong>Ответ:</strong> $b - c$.</p><p><strong>в)</strong> В выражении $(\sqrt{m} + \sqrt{5})^2 - (m + 5)$ сначала раскроем квадрат суммы по формуле $(x+y)^2 = x^2 + 2xy + y^2$.</p><p>$(\sqrt{m} + \sqrt{5})^2 = (\sqrt{m})^2 + 2 \cdot \sqrt{m} \cdot \sqrt{5} + (\sqrt{5})^2 = m + 2\sqrt{5m} + 5$.</p><p>Теперь подставим полученное выражение в исходное:</p><p>$(m + 2\sqrt{5m} + 5) - (m + 5) = m + 2\sqrt{5m} + 5 - m - 5$.</p><p>Приводим подобные слагаемые:</p><p>$(m-m) + (5-5) + 2\sqrt{5m} = 0 + 0 + 2\sqrt{5m} = 2\sqrt{5m}$.</p><p><strong>Ответ:</strong> $2\sqrt{5m}$.</p><p><strong>г)</strong> В выражении $(n + 10) - (\sqrt{10} - \sqrt{n})^2$ сначала раскроем квадрат разности по формуле $(x-y)^2 = x^2 - 2xy + y^2$.</p><p>$(\sqrt{10} - \sqrt{n})^2 = (\sqrt{10})^2 - 2 \cdot \sqrt{10} \cdot \sqrt{n} + (\sqrt{n})^2 = 10 - 2\sqrt{10n} + n$.</p><p>Теперь подставим полученное выражение в исходное и раскроем скобки (знаки внутри скобок меняются на противоположные):</p><p>$(n + 10) - (10 - 2\sqrt{10n} + n) = n + 10 - 10 + 2\sqrt{10n} - n$.</p><p>Приводим подобные слагаемые:</p><p>$(n-n) + (10-10) + 2\sqrt{10n} = 0 + 0 + 2\sqrt{10n} = 2\sqrt{10n}$.</p><p><strong>Ответ:</strong> $2\sqrt{10n}$.</p>"
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№4 (с. 11)
Условие. №4 (с. 11)
скриншот условия
Алгебра, 9 класс Учебник, авторы: Солтан Генадий Николаевич, Солтан Алла Евгеньевна, Жумадилова Аманбала Жумадиловна, издательство Кокшетау, Алматы, 2019, страница 11, номер 4, Условие

4. Упростите выражение:

а) $(4 + \sqrt{a})(4 - \sqrt{a});$

б) $(\sqrt{b} + \sqrt{c})(\sqrt{b} - \sqrt{c});$

в) $(\sqrt{m} + \sqrt{5})^2 - (m + 5);$

г) $(n + 10) - (\sqrt{10} - \sqrt{n})^2.$

Решение. №4 (с. 11)
Алгебра, 9 класс Учебник, авторы: Солтан Генадий Николаевич, Солтан Алла Евгеньевна, Жумадилова Аманбала Жумадиловна, издательство Кокшетау, Алматы, 2019, страница 11, номер 4, Решение
Алгебра, 9 класс Учебник, авторы: Солтан Генадий Николаевич, Солтан Алла Евгеньевна, Жумадилова Аманбала Жумадиловна, издательство Кокшетау, Алматы, 2019, страница 11, номер 4, Решение (продолжение 2)
Решение 2 (rus). №4 (с. 11)

а) Для упрощения выражения $(4 + \sqrt{a})(4 - \sqrt{a})$ используется формула сокращенного умножения "разность квадратов": $(x+y)(x-y) = x^2 - y^2$. В данном случае $x=4$ и $y=\sqrt{a}$.

Применяя формулу, получаем:

$(4 + \sqrt{a})(4 - \sqrt{a}) = 4^2 - (\sqrt{a})^2 = 16 - a$.

Ответ: $16 - a$.

б) Выражение $(\sqrt{b} + \sqrt{c})(\sqrt{b} - \sqrt{c})$ также упрощается с помощью формулы разности квадратов. Здесь $x=\sqrt{b}$ и $y=\sqrt{c}$.

Применяя формулу, получаем:

$(\sqrt{b} + \sqrt{c})(\sqrt{b} - \sqrt{c}) = (\sqrt{b})^2 - (\sqrt{c})^2 = b - c$.

Ответ: $b - c$.

в) В выражении $(\sqrt{m} + \sqrt{5})^2 - (m + 5)$ сначала раскроем квадрат суммы по формуле $(x+y)^2 = x^2 + 2xy + y^2$.

$(\sqrt{m} + \sqrt{5})^2 = (\sqrt{m})^2 + 2 \cdot \sqrt{m} \cdot \sqrt{5} + (\sqrt{5})^2 = m + 2\sqrt{5m} + 5$.

Теперь подставим полученное выражение в исходное:

$(m + 2\sqrt{5m} + 5) - (m + 5) = m + 2\sqrt{5m} + 5 - m - 5$.

Приводим подобные слагаемые:

$(m-m) + (5-5) + 2\sqrt{5m} = 0 + 0 + 2\sqrt{5m} = 2\sqrt{5m}$.

Ответ: $2\sqrt{5m}$.

г) В выражении $(n + 10) - (\sqrt{10} - \sqrt{n})^2$ сначала раскроем квадрат разности по формуле $(x-y)^2 = x^2 - 2xy + y^2$.

$(\sqrt{10} - \sqrt{n})^2 = (\sqrt{10})^2 - 2 \cdot \sqrt{10} \cdot \sqrt{n} + (\sqrt{n})^2 = 10 - 2\sqrt{10n} + n$.

Теперь подставим полученное выражение в исходное и раскроем скобки (знаки внутри скобок меняются на противоположные):

$(n + 10) - (10 - 2\sqrt{10n} + n) = n + 10 - 10 + 2\sqrt{10n} - n$.

Приводим подобные слагаемые:

$(n-n) + (10-10) + 2\sqrt{10n} = 0 + 0 + 2\sqrt{10n} = 2\sqrt{10n}$.

Ответ: $2\sqrt{10n}$.

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