Номер 130, страница 43 - 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

I. Уравнения, неравенства с двумя переменными и их системы. 4. Неравенства с двумя переменными - номер 130, страница 43.

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            "text" => "<p>Нам необходимо найти количество пар целых чисел $(x, y)$, которые удовлетворяют неравенству $x^2 + y^2 \le 2$.</p><p>Поскольку $x$ и $y$ являются целыми числами, их квадраты $x^2$ и $y^2$ также являются неотрицательными целыми числами (например, 0, 1, 4, 9, и так далее).</p><p>Из условия $x^2 \ge 0$ и $y^2 \ge 0$ и из самого неравенства $x^2 + y^2 \le 2$ следует, что ни $x^2$, ни $y^2$ не могут превышать 2. То есть, $x^2 \le 2$ и $y^2 \le 2$.</p><p>Найдем все возможные целые значения для $x$, для которых выполняется условие $x^2 \le 2$. Такими значениями для $x^2$ могут быть только 0 и 1.</p><ul><li>Если $x^2 = 0$, то $x = 0$.</li><li>Если $x^2 = 1$, то $x = 1$ или $x = -1$.</li></ul><p>Следовательно, переменная $x$ может принимать только значения из множества $\{-1, 0, 1\}$. Проверим каждый из этих случаев.</p><p><strong>Случай 1: $x = 0$</strong><br>Подставим $x = 0$ в исходное неравенство:$0^2 + y^2 \le 2$<br>$y^2 \le 2$<br>Поскольку $y$ — целое число, возможные значения для $y^2$ — это 0 и 1.<ul><li>Если $y^2 = 0$, то $y = 0$. Получаем пару (0, 0).</li><li>Если $y^2 = 1$, то $y = 1$ или $y = -1$. Получаем пары (0, 1) и (0, -1).</li></ul>В этом случае мы нашли 3 пары решений.</p><p><strong>Случай 2: $x = 1$</strong><br>Подставим $x = 1$ в неравенство:$1^2 + y^2 \le 2$<br>$1 + y^2 \le 2$<br>$y^2 \le 1$<br>Возможные значения для $y^2$ — это 0 и 1.<ul><li>Если $y^2 = 0$, то $y = 0$. Получаем пару (1, 0).</li><li>Если $y^2 = 1$, то $y = 1$ или $y = -1$. Получаем пары (1, 1) и (1, -1).</li></ul>В этом случае мы нашли еще 3 пары решений.</p><p><strong>Случай 3: $x = -1$</strong><br>Подставим $x = -1$ в неравенство:$(-1)^2 + y^2 \le 2$<br>$1 + y^2 \le 2$<br>$y^2 \le 1$<br>Этот случай аналогичен предыдущему. Возможные значения для $y$ — это 0, 1 и -1.<ul><li>Если $y = 0$, получаем пару (-1, 0).</li><li>Если $y = 1$, получаем пару (-1, 1).</li><li>Если $y = -1$, получаем пару (-1, -1).</li></ul>И в этом случае мы нашли 3 пары решений.</p><p>Теперь суммируем количество пар из всех случаев. Все полученные пары различны:(0, 0), (0, 1), (0, -1), (1, 0), (1, 1), (1, -1), (-1, 0), (-1, 1), (-1, -1).Общее количество пар равно $3 + 3 + 3 = 9$.</p><p><strong>Ответ:</strong> 9</p>"
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            "text" => "<p>Нам необходимо найти количество пар целых чисел $(x, y)$, которые удовлетворяют неравенству $x^2 + y^2 \le 2$.</p><p>Поскольку $x$ и $y$ являются целыми числами, их квадраты $x^2$ и $y^2$ также являются неотрицательными целыми числами (например, 0, 1, 4, 9, и так далее).</p><p>Из условия $x^2 \ge 0$ и $y^2 \ge 0$ и из самого неравенства $x^2 + y^2 \le 2$ следует, что ни $x^2$, ни $y^2$ не могут превышать 2. То есть, $x^2 \le 2$ и $y^2 \le 2$.</p><p>Найдем все возможные целые значения для $x$, для которых выполняется условие $x^2 \le 2$. Такими значениями для $x^2$ могут быть только 0 и 1.</p><ul><li>Если $x^2 = 0$, то $x = 0$.</li><li>Если $x^2 = 1$, то $x = 1$ или $x = -1$.</li></ul><p>Следовательно, переменная $x$ может принимать только значения из множества $\{-1, 0, 1\}$. Проверим каждый из этих случаев.</p><p><strong>Случай 1: $x = 0$</strong><br>Подставим $x = 0$ в исходное неравенство:$0^2 + y^2 \le 2$<br>$y^2 \le 2$<br>Поскольку $y$ — целое число, возможные значения для $y^2$ — это 0 и 1.<ul><li>Если $y^2 = 0$, то $y = 0$. Получаем пару (0, 0).</li><li>Если $y^2 = 1$, то $y = 1$ или $y = -1$. Получаем пары (0, 1) и (0, -1).</li></ul>В этом случае мы нашли 3 пары решений.</p><p><strong>Случай 2: $x = 1$</strong><br>Подставим $x = 1$ в неравенство:$1^2 + y^2 \le 2$<br>$1 + y^2 \le 2$<br>$y^2 \le 1$<br>Возможные значения для $y^2$ — это 0 и 1.<ul><li>Если $y^2 = 0$, то $y = 0$. Получаем пару (1, 0).</li><li>Если $y^2 = 1$, то $y = 1$ или $y = -1$. Получаем пары (1, 1) и (1, -1).</li></ul>В этом случае мы нашли еще 3 пары решений.</p><p><strong>Случай 3: $x = -1$</strong><br>Подставим $x = -1$ в неравенство:$(-1)^2 + y^2 \le 2$<br>$1 + y^2 \le 2$<br>$y^2 \le 1$<br>Этот случай аналогичен предыдущему. Возможные значения для $y$ — это 0, 1 и -1.<ul><li>Если $y = 0$, получаем пару (-1, 0).</li><li>Если $y = 1$, получаем пару (-1, 1).</li><li>Если $y = -1$, получаем пару (-1, -1).</li></ul>И в этом случае мы нашли 3 пары решений.</p><p>Теперь суммируем количество пар из всех случаев. Все полученные пары различны:(0, 0), (0, 1), (0, -1), (1, 0), (1, 1), (1, -1), (-1, 0), (-1, 1), (-1, -1).Общее количество пар равно $3 + 3 + 3 = 9$.</p><p><strong>Ответ:</strong> 9</p>"
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№130 (с. 43)
Условие. №130 (с. 43)
скриншот условия
Алгебра, 9 класс Учебник, авторы: Солтан Генадий Николаевич, Солтан Алла Евгеньевна, Жумадилова Аманбала Жумадиловна, издательство Кокшетау, Алматы, 2019, страница 43, номер 130, Условие

130. Установите, сколько пар целых чисел являются решениями неравенства $x^2+y^2 \leq 2$.

Решение. №130 (с. 43)
Алгебра, 9 класс Учебник, авторы: Солтан Генадий Николаевич, Солтан Алла Евгеньевна, Жумадилова Аманбала Жумадиловна, издательство Кокшетау, Алматы, 2019, страница 43, номер 130, Решение
Решение 2 (rus). №130 (с. 43)

Нам необходимо найти количество пар целых чисел $(x, y)$, которые удовлетворяют неравенству $x^2 + y^2 \le 2$.

Поскольку $x$ и $y$ являются целыми числами, их квадраты $x^2$ и $y^2$ также являются неотрицательными целыми числами (например, 0, 1, 4, 9, и так далее).

Из условия $x^2 \ge 0$ и $y^2 \ge 0$ и из самого неравенства $x^2 + y^2 \le 2$ следует, что ни $x^2$, ни $y^2$ не могут превышать 2. То есть, $x^2 \le 2$ и $y^2 \le 2$.

Найдем все возможные целые значения для $x$, для которых выполняется условие $x^2 \le 2$. Такими значениями для $x^2$ могут быть только 0 и 1.

  • Если $x^2 = 0$, то $x = 0$.
  • Если $x^2 = 1$, то $x = 1$ или $x = -1$.

Следовательно, переменная $x$ может принимать только значения из множества $\{-1, 0, 1\}$. Проверим каждый из этих случаев.

Случай 1: $x = 0$
Подставим $x = 0$ в исходное неравенство:$0^2 + y^2 \le 2$
$y^2 \le 2$
Поскольку $y$ — целое число, возможные значения для $y^2$ — это 0 и 1.

  • Если $y^2 = 0$, то $y = 0$. Получаем пару (0, 0).
  • Если $y^2 = 1$, то $y = 1$ или $y = -1$. Получаем пары (0, 1) и (0, -1).
В этом случае мы нашли 3 пары решений.

Случай 2: $x = 1$
Подставим $x = 1$ в неравенство:$1^2 + y^2 \le 2$
$1 + y^2 \le 2$
$y^2 \le 1$
Возможные значения для $y^2$ — это 0 и 1.

  • Если $y^2 = 0$, то $y = 0$. Получаем пару (1, 0).
  • Если $y^2 = 1$, то $y = 1$ или $y = -1$. Получаем пары (1, 1) и (1, -1).
В этом случае мы нашли еще 3 пары решений.

Случай 3: $x = -1$
Подставим $x = -1$ в неравенство:$(-1)^2 + y^2 \le 2$
$1 + y^2 \le 2$
$y^2 \le 1$
Этот случай аналогичен предыдущему. Возможные значения для $y$ — это 0, 1 и -1.

  • Если $y = 0$, получаем пару (-1, 0).
  • Если $y = 1$, получаем пару (-1, 1).
  • Если $y = -1$, получаем пару (-1, -1).
И в этом случае мы нашли 3 пары решений.

Теперь суммируем количество пар из всех случаев. Все полученные пары различны:(0, 0), (0, 1), (0, -1), (1, 0), (1, 1), (1, -1), (-1, 0), (-1, 1), (-1, -1).Общее количество пар равно $3 + 3 + 3 = 9$.

Ответ: 9

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