Номер 34, страница 176, часть 1 - гдз по алгебре 10 класс учебник Пак, Ардакулы

Алгебра, 10 класс Учебник, авторы: Пак Олег Владимирович, Ардакулы Дархан, Ескендирова Елена Викторовна, издательство Алматыкітап баспасы, Алматы, 2019

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

Тип: Учебник

Издательство: Алматыкітап баспасы

Год издания: 2019 - 2026

Часть: 1

ISBN: 978-601-01-3958-9

Рекомендовано Министерством образования и науки Республики Казахстан

Часть 1. Глава 3. Тригонометрические уравнения и неравенства. Параграф 3. Простейшие тригонометрические неравенства. 3.4. Системы простейших тригонометрических неравенств. Задачи - номер 34, страница 176.

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        1 => App\Models\Branch {#1063
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        2 => App\Models\Branch {#1101
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                    "created_at" => "2026-04-10 13:58:26"
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                0 => App\Models\Branch {#1106
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                  #keyType: "int"
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          ]
        }
        3 => App\Models\Branch {#1144
          #connection: "mysql"
          #table: "branches"
          #primaryKey: "id"
          #keyType: "int"
          +incrementing: true
          #with: []
          #withCount: []
          +preventsLazyLoading: false
          #perPage: 15
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            "created_at" => "2026-04-10 13:58:26"
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            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1147
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                0 => App\Models\Branch {#1148
                  #connection: "mysql"
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        }
        4 => App\Models\Branch {#1219
          #connection: "mysql"
          #table: "branches"
          #primaryKey: "id"
          #keyType: "int"
          +incrementing: true
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            "field_display_title" => "Задачи"
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            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1220
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            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1222
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                0 => App\Models\Branch {#1223
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            "task" => array:2 [
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            "text" => "<p><strong>34. (2)</strong> $\begin{cases} \operatorname{tg} x \ge 1, \\ \cos x \le \frac{\sqrt{3}}{2}. \end{cases}$</p>"
            "img" => array:1 [
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                "name" => "34-1.jpg"
                "alt" => null
                "width" => "479"
                "height" => 259
                "path" => "/media/algebra_10/baspasy-u19/0-3-3-4zad/34-1.webp?ts=1753534715"
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          #table: "elements"
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          #with: []
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            "created_at" => "2026-04-10 13:58:26"
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                0 => App\Models\Edition {#1238
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                  #keyType: "int"
                  +incrementing: false
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                  #attributes: array:21 [
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                    "created_at" => "2026-04-10 13:58:26"
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                    "title" => "Решение 2 (rus)"
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                    "field_solution_author" => "Gemini 2.5 Pro"
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                    "field_edition_type" => "solution"
                    "field_root_dir" => "2-"
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            "task" => array:2 [
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            "text" => "<p>Для решения данной системы неравенств $\begin{cases} \tg x \ge 1 \\ \cos x \le \frac{\sqrt{3}}{2} \end{cases}$ необходимо найти множество значений $x$, удовлетворяющих обоим неравенствам одновременно. Решим каждое неравенство по отдельности.</p><p>1. Решим первое неравенство: $\tg x \ge 1$.</p><p>Сначала найдем значения $x$, для которых $\tg x = 1$. Главное решение этого уравнения — $x = \operatorname{arctg}(1) = \frac{\pi}{4}$. Поскольку функция тангенса имеет период $\pi$, все решения уравнения $\tg x = 1$ задаются формулой $x = \frac{\pi}{4} + \pi k$, где $k \in \mathbb{Z}$.</p><p>Функция $y = \tg x$ является возрастающей на каждом из своих интервалов определения $(-\frac{\pi}{2} + \pi k, \frac{\pi}{2} + \pi k)$. Вертикальные асимптоты графика находятся в точках $x = \frac{\pi}{2} + \pi k$. Таким образом, условие $\tg x \ge 1$ выполняется для $x$, находящихся в промежутке от точки, где $\tg x = 1$, до ближайшей правой асимптоты. Это дает нам решение: $\frac{\pi}{4} + \pi k \le x < \frac{\pi}{2} + \pi k$.</p><p>Итак, решение первого неравенства: $x \in [\frac{\pi}{4} + \pi k, \frac{\pi}{2} + \pi k)$, где $k \in \mathbb{Z}$.</p><p>2. Решим второе неравенство: $\cos x \le \frac{\sqrt{3}}{2}$.</p><p>Сначала найдем значения $x$, для которых $\cos x = \frac{\sqrt{3}}{2}$. Решения этого уравнения: $x = \pm\arccos(\frac{\sqrt{3}}{2}) + 2\pi n = \pm\frac{\pi}{6} + 2\pi n$, где $n \in \mathbb{Z}$.</p><p>На тригонометрической окружности косинус угла соответствует абсциссе (координате $x$) точки. Нам нужны точки, у которых абсцисса меньше или равна $\frac{\sqrt{3}}{2}$. Это соответствует дуге окружности, расположенной левее вертикальной прямой $x = \frac{\sqrt{3}}{2}$. Эта дуга начинается от угла $\frac{\pi}{6}$ и, двигаясь против часовой стрелки, заканчивается в угле $2\pi - \frac{\pi}{6} = \frac{11\pi}{6}$.</p><p>Таким образом, решение второго неравенства: $x \in [\frac{\pi}{6} + 2\pi n, \frac{11\pi}{6} + 2\pi n]$, где $n \in \mathbb{Z}$.</p><p>3. Найдем пересечение множеств решений.</p><p>Для нахождения общего решения системы нам нужно найти пересечение полученных множеств. Рассмотрим решения на одном периоде, например, на отрезке $[0, 2\pi)$.</p><p>Решение первого неравенства на $[0, 2\pi)$ (при $k=0$ и $k=1$): $x \in [\frac{\pi}{4}, \frac{\pi}{2}) \cup [\frac{5\pi}{4}, \frac{3\pi}{2})$.</p><p>Решение второго неравенства на $[0, 2\pi)$ (при $n=0$): $x \in [\frac{\pi}{6}, \frac{11\pi}{6}]$.</p><p>Теперь найдем пересечение этих множеств. Проверим, принадлежат ли интервалы из решения первого неравенства множеству решений второго.</p><p>Для интервала $[\frac{\pi}{4}, \frac{\pi}{2})$: все значения $x$ из этого интервала находятся в первой четверти. Значение $\cos x$ убывает на этом интервале от $\cos(\frac{\pi}{4}) = \frac{\sqrt{2}}{2}$ до $\cos(\frac{\pi}{2}) = 0$. Так как $\frac{\sqrt{2}}{2} < \frac{\sqrt{3}}{2}$, то для любого $x$ из этого интервала выполняется $\cos x \le \frac{\sqrt{2}}{2} < \frac{\sqrt{3}}{2}$. Следовательно, весь интервал $[\frac{\pi}{4}, \frac{\pi}{2})$ является решением системы.</p><p>Для интервала $[\frac{5\pi}{4}, \frac{3\pi}{2})$: все значения $x$ из этого интервала находятся в третьей четверти. Для любого такого $x$ значение $\cos x$ отрицательно. Любое отрицательное число меньше положительного числа $\frac{\sqrt{3}}{2}$, поэтому $\cos x < 0 \le \frac{\sqrt{3}}{2}$. Следовательно, весь интервал $[\frac{5\pi}{4}, \frac{3\pi}{2})$ также является решением системы.</p><p>Таким образом, множество решений первого неравенства является подмножеством множества решений второго неравенства. Это означает, что их пересечение совпадает с множеством решений первого неравенства.</p><p><strong>Ответ:</strong> $x \in [\frac{\pi}{4} + \pi k, \frac{\pi}{2} + \pi k)$, где $k \in \mathbb{Z}$.</p>"
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            "text" => "<p>Для решения данной системы неравенств $\begin{cases} \tg x \ge 1 \\ \cos x \le \frac{\sqrt{3}}{2} \end{cases}$ необходимо найти множество значений $x$, удовлетворяющих обоим неравенствам одновременно. Решим каждое неравенство по отдельности.</p><p>1. Решим первое неравенство: $\tg x \ge 1$.</p><p>Сначала найдем значения $x$, для которых $\tg x = 1$. Главное решение этого уравнения — $x = \operatorname{arctg}(1) = \frac{\pi}{4}$. Поскольку функция тангенса имеет период $\pi$, все решения уравнения $\tg x = 1$ задаются формулой $x = \frac{\pi}{4} + \pi k$, где $k \in \mathbb{Z}$.</p><p>Функция $y = \tg x$ является возрастающей на каждом из своих интервалов определения $(-\frac{\pi}{2} + \pi k, \frac{\pi}{2} + \pi k)$. Вертикальные асимптоты графика находятся в точках $x = \frac{\pi}{2} + \pi k$. Таким образом, условие $\tg x \ge 1$ выполняется для $x$, находящихся в промежутке от точки, где $\tg x = 1$, до ближайшей правой асимптоты. Это дает нам решение: $\frac{\pi}{4} + \pi k \le x < \frac{\pi}{2} + \pi k$.</p><p>Итак, решение первого неравенства: $x \in [\frac{\pi}{4} + \pi k, \frac{\pi}{2} + \pi k)$, где $k \in \mathbb{Z}$.</p><p>2. Решим второе неравенство: $\cos x \le \frac{\sqrt{3}}{2}$.</p><p>Сначала найдем значения $x$, для которых $\cos x = \frac{\sqrt{3}}{2}$. Решения этого уравнения: $x = \pm\arccos(\frac{\sqrt{3}}{2}) + 2\pi n = \pm\frac{\pi}{6} + 2\pi n$, где $n \in \mathbb{Z}$.</p><p>На тригонометрической окружности косинус угла соответствует абсциссе (координате $x$) точки. Нам нужны точки, у которых абсцисса меньше или равна $\frac{\sqrt{3}}{2}$. Это соответствует дуге окружности, расположенной левее вертикальной прямой $x = \frac{\sqrt{3}}{2}$. Эта дуга начинается от угла $\frac{\pi}{6}$ и, двигаясь против часовой стрелки, заканчивается в угле $2\pi - \frac{\pi}{6} = \frac{11\pi}{6}$.</p><p>Таким образом, решение второго неравенства: $x \in [\frac{\pi}{6} + 2\pi n, \frac{11\pi}{6} + 2\pi n]$, где $n \in \mathbb{Z}$.</p><p>3. Найдем пересечение множеств решений.</p><p>Для нахождения общего решения системы нам нужно найти пересечение полученных множеств. Рассмотрим решения на одном периоде, например, на отрезке $[0, 2\pi)$.</p><p>Решение первого неравенства на $[0, 2\pi)$ (при $k=0$ и $k=1$): $x \in [\frac{\pi}{4}, \frac{\pi}{2}) \cup [\frac{5\pi}{4}, \frac{3\pi}{2})$.</p><p>Решение второго неравенства на $[0, 2\pi)$ (при $n=0$): $x \in [\frac{\pi}{6}, \frac{11\pi}{6}]$.</p><p>Теперь найдем пересечение этих множеств. Проверим, принадлежат ли интервалы из решения первого неравенства множеству решений второго.</p><p>Для интервала $[\frac{\pi}{4}, \frac{\pi}{2})$: все значения $x$ из этого интервала находятся в первой четверти. Значение $\cos x$ убывает на этом интервале от $\cos(\frac{\pi}{4}) = \frac{\sqrt{2}}{2}$ до $\cos(\frac{\pi}{2}) = 0$. Так как $\frac{\sqrt{2}}{2} < \frac{\sqrt{3}}{2}$, то для любого $x$ из этого интервала выполняется $\cos x \le \frac{\sqrt{2}}{2} < \frac{\sqrt{3}}{2}$. Следовательно, весь интервал $[\frac{\pi}{4}, \frac{\pi}{2})$ является решением системы.</p><p>Для интервала $[\frac{5\pi}{4}, \frac{3\pi}{2})$: все значения $x$ из этого интервала находятся в третьей четверти. Для любого такого $x$ значение $\cos x$ отрицательно. Любое отрицательное число меньше положительного числа $\frac{\sqrt{3}}{2}$, поэтому $\cos x < 0 \le \frac{\sqrt{3}}{2}$. Следовательно, весь интервал $[\frac{5\pi}{4}, \frac{3\pi}{2})$ также является решением системы.</p><p>Таким образом, множество решений первого неравенства является подмножеством множества решений второго неравенства. Это означает, что их пересечение совпадает с множеством решений первого неравенства.</p><p><strong>Ответ:</strong> $x \in [\frac{\pi}{4} + \pi k, \frac{\pi}{2} + \pi k)$, где $k \in \mathbb{Z}$.</p>"
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№34 (с. 176)
Условие. №34 (с. 176)
скриншот условия
Алгебра, 10 класс Учебник, авторы: Пак Олег Владимирович, Ардакулы Дархан, Ескендирова Елена Викторовна, издательство Алматыкітап баспасы, Алматы, 2019, Часть 1, страница 176, номер 34, Условие

34. (2) $\begin{cases} \operatorname{tg} x \ge 1, \\ \cos x \le \frac{\sqrt{3}}{2}. \end{cases}$

Решение 2 (rus). №34 (с. 176)

Для решения данной системы неравенств $\begin{cases} \tg x \ge 1 \\ \cos x \le \frac{\sqrt{3}}{2} \end{cases}$ необходимо найти множество значений $x$, удовлетворяющих обоим неравенствам одновременно. Решим каждое неравенство по отдельности.

1. Решим первое неравенство: $\tg x \ge 1$.

Сначала найдем значения $x$, для которых $\tg x = 1$. Главное решение этого уравнения — $x = \operatorname{arctg}(1) = \frac{\pi}{4}$. Поскольку функция тангенса имеет период $\pi$, все решения уравнения $\tg x = 1$ задаются формулой $x = \frac{\pi}{4} + \pi k$, где $k \in \mathbb{Z}$.

Функция $y = \tg x$ является возрастающей на каждом из своих интервалов определения $(-\frac{\pi}{2} + \pi k, \frac{\pi}{2} + \pi k)$. Вертикальные асимптоты графика находятся в точках $x = \frac{\pi}{2} + \pi k$. Таким образом, условие $\tg x \ge 1$ выполняется для $x$, находящихся в промежутке от точки, где $\tg x = 1$, до ближайшей правой асимптоты. Это дает нам решение: $\frac{\pi}{4} + \pi k \le x < \frac{\pi}{2} + \pi k$.

Итак, решение первого неравенства: $x \in [\frac{\pi}{4} + \pi k, \frac{\pi}{2} + \pi k)$, где $k \in \mathbb{Z}$.

2. Решим второе неравенство: $\cos x \le \frac{\sqrt{3}}{2}$.

Сначала найдем значения $x$, для которых $\cos x = \frac{\sqrt{3}}{2}$. Решения этого уравнения: $x = \pm\arccos(\frac{\sqrt{3}}{2}) + 2\pi n = \pm\frac{\pi}{6} + 2\pi n$, где $n \in \mathbb{Z}$.

На тригонометрической окружности косинус угла соответствует абсциссе (координате $x$) точки. Нам нужны точки, у которых абсцисса меньше или равна $\frac{\sqrt{3}}{2}$. Это соответствует дуге окружности, расположенной левее вертикальной прямой $x = \frac{\sqrt{3}}{2}$. Эта дуга начинается от угла $\frac{\pi}{6}$ и, двигаясь против часовой стрелки, заканчивается в угле $2\pi - \frac{\pi}{6} = \frac{11\pi}{6}$.

Таким образом, решение второго неравенства: $x \in [\frac{\pi}{6} + 2\pi n, \frac{11\pi}{6} + 2\pi n]$, где $n \in \mathbb{Z}$.

3. Найдем пересечение множеств решений.

Для нахождения общего решения системы нам нужно найти пересечение полученных множеств. Рассмотрим решения на одном периоде, например, на отрезке $[0, 2\pi)$.

Решение первого неравенства на $[0, 2\pi)$ (при $k=0$ и $k=1$): $x \in [\frac{\pi}{4}, \frac{\pi}{2}) \cup [\frac{5\pi}{4}, \frac{3\pi}{2})$.

Решение второго неравенства на $[0, 2\pi)$ (при $n=0$): $x \in [\frac{\pi}{6}, \frac{11\pi}{6}]$.

Теперь найдем пересечение этих множеств. Проверим, принадлежат ли интервалы из решения первого неравенства множеству решений второго.

Для интервала $[\frac{\pi}{4}, \frac{\pi}{2})$: все значения $x$ из этого интервала находятся в первой четверти. Значение $\cos x$ убывает на этом интервале от $\cos(\frac{\pi}{4}) = \frac{\sqrt{2}}{2}$ до $\cos(\frac{\pi}{2}) = 0$. Так как $\frac{\sqrt{2}}{2} < \frac{\sqrt{3}}{2}$, то для любого $x$ из этого интервала выполняется $\cos x \le \frac{\sqrt{2}}{2} < \frac{\sqrt{3}}{2}$. Следовательно, весь интервал $[\frac{\pi}{4}, \frac{\pi}{2})$ является решением системы.

Для интервала $[\frac{5\pi}{4}, \frac{3\pi}{2})$: все значения $x$ из этого интервала находятся в третьей четверти. Для любого такого $x$ значение $\cos x$ отрицательно. Любое отрицательное число меньше положительного числа $\frac{\sqrt{3}}{2}$, поэтому $\cos x < 0 \le \frac{\sqrt{3}}{2}$. Следовательно, весь интервал $[\frac{5\pi}{4}, \frac{3\pi}{2})$ также является решением системы.

Таким образом, множество решений первого неравенства является подмножеством множества решений второго неравенства. Это означает, что их пересечение совпадает с множеством решений первого неравенства.

Ответ: $x \in [\frac{\pi}{4} + \pi k, \frac{\pi}{2} + \pi k)$, где $k \in \mathbb{Z}$.

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