Номер 4.3, страница 28 - гдз по алгебре 10 класс учебник Абылкасымова, Жумагулова

Алгебра, 10 класс Учебник, авторы: Абылкасымова Алма Есимбековна, Жумагулова Зауре Абдыкеновна, издательство Мектеп, Алматы, 2019

Авторы: Абылкасымова А. Е., Жумагулова З. А.

Тип: Учебник

Издательство: Мектеп

Год издания: 2019 - 2026

ISBN: 978-601-07-1142-6

Утверждено Министерством образования и науки Республики Казахстан

Глава 1. Функция, ее свойства и график. Параграф 4. Обратная функция. Сложная функция - номер 4.3, страница 28.

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            "text" => "<p>Для того чтобы две функции были взаимно-обратными, необходимо, чтобы композиция этих функций в любом порядке давала тождественную функцию ($f(g(x))=x$ и $g(f(x))=x$), а также чтобы исходная функция была обратимой (монотонной) на рассматриваемом промежутке.</p><p>Рассмотрим функцию $f(x) = x^2$. Эта функция определена на всей числовой оси ($x \in \mathbb{R}$), но она не является монотонной на всей этой оси. Она убывает при $x \le 0$ и возрастает при $x \ge 0$. Чтобы найти для нее обратную функцию, необходимо ограничить ее область определения таким образом, чтобы на новом промежутке она была монотонной.</p><p>Рассмотрим вторую функцию $g(x) = \sqrt{x}$. Ее область определения — это множество неотрицательных чисел, то есть $x \ge 0$. На этом промежутке функция $g(x)$ монотонно возрастает, следовательно, она является обратимой.</p><p>Найдем функцию, обратную для $y = x^2$. Для этого сначала выразим $x$ через $y$:</p><p>$y = x^2 \Rightarrow x = \pm\sqrt{y}$</p><p>Затем, по определению обратной функции, меняем переменные $x$ и $y$ местами. Получаем $y = \pm\sqrt{x}$.</p><p>Выбор знака перед корнем зависит от того, на каком промежутке монотонности мы рассматриваем исходную функцию $y = x^2$.</p><p>1. Если мы рассматриваем $y = x^2$ при $x \ge 0$, то ее область значений $y \ge 0$. У обратной функции область определения и область значений меняются местами. Значит, для обратной функции область определения $x \ge 0$ и область значений $y \ge 0$. Этому соответствует функция $y = \sqrt{x}$.</p><p>2. Если мы рассматриваем $y = x^2$ при $x \le 0$, то ее область значений $y \ge 0$. У обратной функции область определения $x \ge 0$ и область значений $y \le 0$. Этому соответствует функция $y = -\sqrt{x}$.</p><p>По условию задачи, нам дана пара функций $y = x^2$ и $y = \sqrt{x}$. Они могут быть взаимно-обратными только в том случае, если мы рассматриваем функцию $y = x^2$ на промежутке $x \ge 0$. На этом же промежутке определена и функция $y = \sqrt{x}$.</p><p>Таким образом, функции $y = x^2$ и $y = \sqrt{x}$ являются взаимно-обратными на общей области определения, где это взаимное соответствие выполняется, то есть при $x \ge 0$.</p><p><strong>Проверка:</strong></p><p>Пусть $f(x) = x^2$, где $x \ge 0$, и $g(x) = \sqrt{x}$, где $x \ge 0$.</p><p>$f(g(x)) = (\sqrt{x})^2 = x$. Равенство верно для всех $x$ из области определения $g(x)$, т.е. для $x \ge 0$.</p><p>$g(f(x)) = \sqrt{x^2} = |x|$. Так как область определения $f(x)$ ограничена $x \ge 0$, то $|x| = x$. Равенство $g(f(x)) = x$ верно для всех $x \ge 0$.</p><p><strong>Ответ:</strong> Функции $y = x^2$ и $y = \sqrt{x}$ являются взаимно-обратными при $x \ge 0$.</p>"
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            "text" => "<p>Для того чтобы две функции были взаимно-обратными, необходимо, чтобы композиция этих функций в любом порядке давала тождественную функцию ($f(g(x))=x$ и $g(f(x))=x$), а также чтобы исходная функция была обратимой (монотонной) на рассматриваемом промежутке.</p><p>Рассмотрим функцию $f(x) = x^2$. Эта функция определена на всей числовой оси ($x \in \mathbb{R}$), но она не является монотонной на всей этой оси. Она убывает при $x \le 0$ и возрастает при $x \ge 0$. Чтобы найти для нее обратную функцию, необходимо ограничить ее область определения таким образом, чтобы на новом промежутке она была монотонной.</p><p>Рассмотрим вторую функцию $g(x) = \sqrt{x}$. Ее область определения — это множество неотрицательных чисел, то есть $x \ge 0$. На этом промежутке функция $g(x)$ монотонно возрастает, следовательно, она является обратимой.</p><p>Найдем функцию, обратную для $y = x^2$. Для этого сначала выразим $x$ через $y$:</p><p>$y = x^2 \Rightarrow x = \pm\sqrt{y}$</p><p>Затем, по определению обратной функции, меняем переменные $x$ и $y$ местами. Получаем $y = \pm\sqrt{x}$.</p><p>Выбор знака перед корнем зависит от того, на каком промежутке монотонности мы рассматриваем исходную функцию $y = x^2$.</p><p>1. Если мы рассматриваем $y = x^2$ при $x \ge 0$, то ее область значений $y \ge 0$. У обратной функции область определения и область значений меняются местами. Значит, для обратной функции область определения $x \ge 0$ и область значений $y \ge 0$. Этому соответствует функция $y = \sqrt{x}$.</p><p>2. Если мы рассматриваем $y = x^2$ при $x \le 0$, то ее область значений $y \ge 0$. У обратной функции область определения $x \ge 0$ и область значений $y \le 0$. Этому соответствует функция $y = -\sqrt{x}$.</p><p>По условию задачи, нам дана пара функций $y = x^2$ и $y = \sqrt{x}$. Они могут быть взаимно-обратными только в том случае, если мы рассматриваем функцию $y = x^2$ на промежутке $x \ge 0$. На этом же промежутке определена и функция $y = \sqrt{x}$.</p><p>Таким образом, функции $y = x^2$ и $y = \sqrt{x}$ являются взаимно-обратными на общей области определения, где это взаимное соответствие выполняется, то есть при $x \ge 0$.</p><p><strong>Проверка:</strong></p><p>Пусть $f(x) = x^2$, где $x \ge 0$, и $g(x) = \sqrt{x}$, где $x \ge 0$.</p><p>$f(g(x)) = (\sqrt{x})^2 = x$. Равенство верно для всех $x$ из области определения $g(x)$, т.е. для $x \ge 0$.</p><p>$g(f(x)) = \sqrt{x^2} = |x|$. Так как область определения $f(x)$ ограничена $x \ge 0$, то $|x| = x$. Равенство $g(f(x)) = x$ верно для всех $x \ge 0$.</p><p><strong>Ответ:</strong> Функции $y = x^2$ и $y = \sqrt{x}$ являются взаимно-обратными при $x \ge 0$.</p>"
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                2 => App\Models\Task {#1231
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                3 => App\Models\Task {#1245
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                4 => App\Models\Task {#1257
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                5 => App\Models\Task {#1275
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                6 => App\Models\Task {#1280
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                7 => App\Models\Task {#1294
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                8 => App\Models\Task {#1308
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                    "field_task_type" => Illuminate\Database\Eloquent\Collection {#1305 …2}
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№4.3 (с. 28)
Условие. №4.3 (с. 28)
скриншот условия
Алгебра, 10 класс Учебник, авторы: Абылкасымова Алма Есимбековна, Жумагулова Зауре Абдыкеновна, издательство Мектеп, Алматы, 2019, страница 28, номер 4.3, Условие

4.3. При каких значениях переменной $x$ функции $y = x^2$ и $y = \sqrt{x}$ являются взаимно-обратными?

Решение. №4.3 (с. 28)
Алгебра, 10 класс Учебник, авторы: Абылкасымова Алма Есимбековна, Жумагулова Зауре Абдыкеновна, издательство Мектеп, Алматы, 2019, страница 28, номер 4.3, Решение
Решение 2. №4.3 (с. 28)

Для того чтобы две функции были взаимно-обратными, необходимо, чтобы композиция этих функций в любом порядке давала тождественную функцию ($f(g(x))=x$ и $g(f(x))=x$), а также чтобы исходная функция была обратимой (монотонной) на рассматриваемом промежутке.

Рассмотрим функцию $f(x) = x^2$. Эта функция определена на всей числовой оси ($x \in \mathbb{R}$), но она не является монотонной на всей этой оси. Она убывает при $x \le 0$ и возрастает при $x \ge 0$. Чтобы найти для нее обратную функцию, необходимо ограничить ее область определения таким образом, чтобы на новом промежутке она была монотонной.

Рассмотрим вторую функцию $g(x) = \sqrt{x}$. Ее область определения — это множество неотрицательных чисел, то есть $x \ge 0$. На этом промежутке функция $g(x)$ монотонно возрастает, следовательно, она является обратимой.

Найдем функцию, обратную для $y = x^2$. Для этого сначала выразим $x$ через $y$:

$y = x^2 \Rightarrow x = \pm\sqrt{y}$

Затем, по определению обратной функции, меняем переменные $x$ и $y$ местами. Получаем $y = \pm\sqrt{x}$.

Выбор знака перед корнем зависит от того, на каком промежутке монотонности мы рассматриваем исходную функцию $y = x^2$.

1. Если мы рассматриваем $y = x^2$ при $x \ge 0$, то ее область значений $y \ge 0$. У обратной функции область определения и область значений меняются местами. Значит, для обратной функции область определения $x \ge 0$ и область значений $y \ge 0$. Этому соответствует функция $y = \sqrt{x}$.

2. Если мы рассматриваем $y = x^2$ при $x \le 0$, то ее область значений $y \ge 0$. У обратной функции область определения $x \ge 0$ и область значений $y \le 0$. Этому соответствует функция $y = -\sqrt{x}$.

По условию задачи, нам дана пара функций $y = x^2$ и $y = \sqrt{x}$. Они могут быть взаимно-обратными только в том случае, если мы рассматриваем функцию $y = x^2$ на промежутке $x \ge 0$. На этом же промежутке определена и функция $y = \sqrt{x}$.

Таким образом, функции $y = x^2$ и $y = \sqrt{x}$ являются взаимно-обратными на общей области определения, где это взаимное соответствие выполняется, то есть при $x \ge 0$.

Проверка:

Пусть $f(x) = x^2$, где $x \ge 0$, и $g(x) = \sqrt{x}$, где $x \ge 0$.

$f(g(x)) = (\sqrt{x})^2 = x$. Равенство верно для всех $x$ из области определения $g(x)$, т.е. для $x \ge 0$.

$g(f(x)) = \sqrt{x^2} = |x|$. Так как область определения $f(x)$ ограничена $x \ge 0$, то $|x| = x$. Равенство $g(f(x)) = x$ верно для всех $x \ge 0$.

Ответ: Функции $y = x^2$ и $y = \sqrt{x}$ являются взаимно-обратными при $x \ge 0$.

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