Номер 5, страница 147, часть 2 - гдз по алгебре 10 класс учебник Пак, Ардакулы

Авторы: Пак О. В., Ардакулы Д., Ескендирова Е. В.

Тип: Учебник

Издательство: Алматыкітап баспасы

Год издания: 2019 - 2026

Часть: 2

ISBN: 978-601-01-3958-9

Рекомендовано Министерством образования и науки Республики Казахстан

Часть 2. Повторение. Серия 4 - номер 5, страница 147.

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          #table: "branches"
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            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1149
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              ]
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            }
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1151
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        2 => App\Models\Branch {#1152
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            "created_at" => "2026-04-10 13:58:26"
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            "field_page_start" => "147"
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            }
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                0 => App\Models\Branch {#1162
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                  #table: "branches"
                  #primaryKey: "id"
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            "task" => array:2 [
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            "img" => array:1 [
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                "alt" => null
                "width" => "1011"
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                "path" => "/media/algebra_10/baspasy-u19/0-povtor2-4/5-1.webp?ts=1753535005"
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          #table: "elements"
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          #keyType: "int"
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                  #keyType: "int"
                  +incrementing: false
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            "text" => "<p><strong>А.</strong></p><p>Областью определения функции арксинус является отрезок $[-1, 1]$. Следовательно, для функции $y=\arcsin(x^2+x-1)$ должно выполняться неравенство:</p><p>$-1 \le x^2+x-1 \le 1$</p><p>Это двойное неравенство равносильно системе двух неравенств:</p><p>$\begin{cases} x^2+x-1 \ge -1 \\ x^2+x-1 \le 1 \end{cases}$</p><p>Решим первое неравенство системы:</p><p>$x^2+x-1 \ge -1$</p><p>$x^2+x \ge 0$</p><p>$x(x+1) \ge 0$</p><p>Найдем корни уравнения $x(x+1)=0$. Корни $x_1 = 0$ и $x_2 = -1$. Графиком функции $f(x)=x^2+x$ является парабола с ветвями вверх. Следовательно, неравенство $x(x+1) \ge 0$ выполняется при $x \in (-\infty, -1] \cup [0, +\infty)$.</p><p>Решим второе неравенство системы:</p><p>$x^2+x-1 \le 1$</p><p>$x^2+x-2 \le 0$</p><p>Найдем корни уравнения $x^2+x-2 = 0$. По теореме Виета или через дискриминант находим корни $x_1 = 1$ и $x_2 = -2$. Графиком функции $g(x)=x^2+x-2$ является парабола с ветвями вверх. Следовательно, неравенство $x^2+x-2 \le 0$ выполняется при $x \in [-2, 1]$.</p><p>Теперь найдем пересечение решений двух неравенств: $(-\infty, -1] \cup [0, +\infty)$ и $[-2, 1]$.</p><p>Пересечение множеств дает нам итоговый результат $x \in [-2, -1] \cup [0, 1]$.</p><p><strong>Ответ:</strong> $D(y) = [-2, -1] \cup [0, 1]$.</p><p><strong>Б.</strong></p><p>Область определения функции арккосинус, так же как и у арксинуса, является отрезок $[-1, 1]$. Кроме того, выражение под знаком квадратного корня должно быть неотрицательным. Таким образом, для функции $y=\arccos(\sqrt{2-x})$ должны одновременно выполняться два условия:</p><p>1. Аргумент подкоренного выражения должен быть неотрицательным: $2-x \ge 0$.</p><p>2. Аргумент арккосинуса должен принадлежать отрезку $[-1, 1]$: $-1 \le \sqrt{2-x} \le 1$.</p><p>Объединим эти условия в систему:</p><p>$\begin{cases} 2-x \ge 0 \\ -1 \le \sqrt{2-x} \le 1 \end{cases}$</p><p>Рассмотрим первое неравенство:</p><p>$2-x \ge 0 \implies x \le 2$.</p><p>Рассмотрим второе (двойное) неравенство: $-1 \le \sqrt{2-x} \le 1$.</p><p>Поскольку квадратный корень по определению всегда неотрицателен ($\sqrt{2-x} \ge 0$), левая часть двойного неравенства, $\sqrt{2-x} \ge -1$, выполняется для всех $x$, для которых корень определен (то есть для $x \le 2$).</p><p>Поэтому остается решить только правую часть неравенства:</p><p>$\sqrt{2-x} \le 1$</p><p>Так как обе части неравенства неотрицательны, мы можем возвести их в квадрат, сохранив знак неравенства:</p><p>$(\sqrt{2-x})^2 \le 1^2$</p><p>$2-x \le 1$</p><p>$-x \le -1$</p><p>$x \ge 1$</p><p>Теперь найдем пересечение решений всех условий: $x \le 2$ и $x \ge 1$.</p><p>Это соответствует отрезку $[1, 2]$.</p><p><strong>Ответ:</strong> $D(y) = [1, 2]$.</p>"
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            "text" => "<p><strong>А.</strong></p><p>Областью определения функции арксинус является отрезок $[-1, 1]$. Следовательно, для функции $y=\arcsin(x^2+x-1)$ должно выполняться неравенство:</p><p>$-1 \le x^2+x-1 \le 1$</p><p>Это двойное неравенство равносильно системе двух неравенств:</p><p>$\begin{cases} x^2+x-1 \ge -1 \\ x^2+x-1 \le 1 \end{cases}$</p><p>Решим первое неравенство системы:</p><p>$x^2+x-1 \ge -1$</p><p>$x^2+x \ge 0$</p><p>$x(x+1) \ge 0$</p><p>Найдем корни уравнения $x(x+1)=0$. Корни $x_1 = 0$ и $x_2 = -1$. Графиком функции $f(x)=x^2+x$ является парабола с ветвями вверх. Следовательно, неравенство $x(x+1) \ge 0$ выполняется при $x \in (-\infty, -1] \cup [0, +\infty)$.</p><p>Решим второе неравенство системы:</p><p>$x^2+x-1 \le 1$</p><p>$x^2+x-2 \le 0$</p><p>Найдем корни уравнения $x^2+x-2 = 0$. По теореме Виета или через дискриминант находим корни $x_1 = 1$ и $x_2 = -2$. Графиком функции $g(x)=x^2+x-2$ является парабола с ветвями вверх. Следовательно, неравенство $x^2+x-2 \le 0$ выполняется при $x \in [-2, 1]$.</p><p>Теперь найдем пересечение решений двух неравенств: $(-\infty, -1] \cup [0, +\infty)$ и $[-2, 1]$.</p><p>Пересечение множеств дает нам итоговый результат $x \in [-2, -1] \cup [0, 1]$.</p><p><strong>Ответ:</strong> $D(y) = [-2, -1] \cup [0, 1]$.</p><p><strong>Б.</strong></p><p>Область определения функции арккосинус, так же как и у арксинуса, является отрезок $[-1, 1]$. Кроме того, выражение под знаком квадратного корня должно быть неотрицательным. Таким образом, для функции $y=\arccos(\sqrt{2-x})$ должны одновременно выполняться два условия:</p><p>1. Аргумент подкоренного выражения должен быть неотрицательным: $2-x \ge 0$.</p><p>2. Аргумент арккосинуса должен принадлежать отрезку $[-1, 1]$: $-1 \le \sqrt{2-x} \le 1$.</p><p>Объединим эти условия в систему:</p><p>$\begin{cases} 2-x \ge 0 \\ -1 \le \sqrt{2-x} \le 1 \end{cases}$</p><p>Рассмотрим первое неравенство:</p><p>$2-x \ge 0 \implies x \le 2$.</p><p>Рассмотрим второе (двойное) неравенство: $-1 \le \sqrt{2-x} \le 1$.</p><p>Поскольку квадратный корень по определению всегда неотрицателен ($\sqrt{2-x} \ge 0$), левая часть двойного неравенства, $\sqrt{2-x} \ge -1$, выполняется для всех $x$, для которых корень определен (то есть для $x \le 2$).</p><p>Поэтому остается решить только правую часть неравенства:</p><p>$\sqrt{2-x} \le 1$</p><p>Так как обе части неравенства неотрицательны, мы можем возвести их в квадрат, сохранив знак неравенства:</p><p>$(\sqrt{2-x})^2 \le 1^2$</p><p>$2-x \le 1$</p><p>$-x \le -1$</p><p>$x \ge 1$</p><p>Теперь найдем пересечение решений всех условий: $x \le 2$ и $x \ge 1$.</p><p>Это соответствует отрезку $[1, 2]$.</p><p><strong>Ответ:</strong> $D(y) = [1, 2]$.</p>"
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№5 (с. 147)
Условие. №5 (с. 147)
скриншот условия
Алгебра, 10 класс Учебник, авторы: Пак Олег Владимирович, Ардакулы Дархан, Ескендирова Елена Викторовна, издательство Алматыкітап баспасы, Алматы, 2019, Часть 2, страница 147, номер 5, Условие

5. Найдите область определения функций:

А. $y=\arcsin(x^2+x-1)$;

Б. $y=\arccos(\sqrt{2-x})$.

Решение 2 (rus). №5 (с. 147)

А.

Областью определения функции арксинус является отрезок $[-1, 1]$. Следовательно, для функции $y=\arcsin(x^2+x-1)$ должно выполняться неравенство:

$-1 \le x^2+x-1 \le 1$

Это двойное неравенство равносильно системе двух неравенств:

$\begin{cases} x^2+x-1 \ge -1 \\ x^2+x-1 \le 1 \end{cases}$

Решим первое неравенство системы:

$x^2+x-1 \ge -1$

$x^2+x \ge 0$

$x(x+1) \ge 0$

Найдем корни уравнения $x(x+1)=0$. Корни $x_1 = 0$ и $x_2 = -1$. Графиком функции $f(x)=x^2+x$ является парабола с ветвями вверх. Следовательно, неравенство $x(x+1) \ge 0$ выполняется при $x \in (-\infty, -1] \cup [0, +\infty)$.

Решим второе неравенство системы:

$x^2+x-1 \le 1$

$x^2+x-2 \le 0$

Найдем корни уравнения $x^2+x-2 = 0$. По теореме Виета или через дискриминант находим корни $x_1 = 1$ и $x_2 = -2$. Графиком функции $g(x)=x^2+x-2$ является парабола с ветвями вверх. Следовательно, неравенство $x^2+x-2 \le 0$ выполняется при $x \in [-2, 1]$.

Теперь найдем пересечение решений двух неравенств: $(-\infty, -1] \cup [0, +\infty)$ и $[-2, 1]$.

Пересечение множеств дает нам итоговый результат $x \in [-2, -1] \cup [0, 1]$.

Ответ: $D(y) = [-2, -1] \cup [0, 1]$.

Б.

Область определения функции арккосинус, так же как и у арксинуса, является отрезок $[-1, 1]$. Кроме того, выражение под знаком квадратного корня должно быть неотрицательным. Таким образом, для функции $y=\arccos(\sqrt{2-x})$ должны одновременно выполняться два условия:

1. Аргумент подкоренного выражения должен быть неотрицательным: $2-x \ge 0$.

2. Аргумент арккосинуса должен принадлежать отрезку $[-1, 1]$: $-1 \le \sqrt{2-x} \le 1$.

Объединим эти условия в систему:

$\begin{cases} 2-x \ge 0 \\ -1 \le \sqrt{2-x} \le 1 \end{cases}$

Рассмотрим первое неравенство:

$2-x \ge 0 \implies x \le 2$.

Рассмотрим второе (двойное) неравенство: $-1 \le \sqrt{2-x} \le 1$.

Поскольку квадратный корень по определению всегда неотрицателен ($\sqrt{2-x} \ge 0$), левая часть двойного неравенства, $\sqrt{2-x} \ge -1$, выполняется для всех $x$, для которых корень определен (то есть для $x \le 2$).

Поэтому остается решить только правую часть неравенства:

$\sqrt{2-x} \le 1$

Так как обе части неравенства неотрицательны, мы можем возвести их в квадрат, сохранив знак неравенства:

$(\sqrt{2-x})^2 \le 1^2$

$2-x \le 1$

$-x \le -1$

$x \ge 1$

Теперь найдем пересечение решений всех условий: $x \le 2$ и $x \ge 1$.

Это соответствует отрезку $[1, 2]$.

Ответ: $D(y) = [1, 2]$.

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