Номер 145, страница 49 - 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. 5. Системы неравенств с двумя переменными - номер 145, страница 49.

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            "text" => "<p><strong>а)</strong></p><p>Рассмотрим систему неравенств: $$ \begin{cases} y \ge 0, \\ y \le 3 - x^2. \end{cases} $$ Первое неравенство $y \ge 0$ задает все точки координатной плоскости, которые лежат на оси $Ox$ и выше нее (верхняя полуплоскость).<br>Второе неравенство $y \le 3 - x^2$ задает все точки, которые лежат на параболе $y = 3 - x^2$ и ниже нее. Графиком функции $y = 3 - x^2$ является парабола, ветви которой направлены вниз, а вершина находится в точке $(0, 3)$.<br>Решением системы является пересечение этих двух областей. Это фигура, ограниченная снизу осью абсцисс ($y=0$), а сверху — параболой $y = 3 - x^2$.<br>Найдем точки пересечения параболы с осью $Ox$:<br>$3 - x^2 = 0 \implies x^2 = 3 \implies x = \pm\sqrt{3}$.<br>Таким образом, парабола пересекает ось $Ox$ в точках $(-\sqrt{3}, 0)$ и $(\sqrt{3}, 0)$.<br>Искомая фигура — это сегмент параболы, расположенный в верхней полуплоскости.<br><strong>Ответ:</strong> Фигура, ограниченная отрезком оси $Ox$ от точки $(-\sqrt{3}, 0)$ до точки $(\sqrt{3}, 0)$ и дугой параболы $y = 3 - x^2$, соединяющей эти точки.</p><p><strong>б)</strong></p><p>Рассмотрим систему неравенств: $$ \begin{cases} y \le 0, \\ y \ge x^2 - 4. \end{cases} $$ Первое неравенство $y \le 0$ задает все точки координатной плоскости, которые лежат на оси $Ox$ и ниже нее (нижняя полуплоскость).<br>Второе неравенство $y \ge x^2 - 4$ задает все точки, которые лежат на параболе $y = x^2 - 4$ и выше нее. Графиком функции $y = x^2 - 4$ является парабола, ветви которой направлены вверх, а вершина находится в точке $(0, -4)$.<br>Решением системы является пересечение этих двух областей. Это фигура, ограниченная сверху осью абсцисс ($y=0$), а снизу — параболой $y = x^2 - 4$.<br>Найдем точки пересечения параболы с осью $Ox$:<br>$x^2 - 4 = 0 \implies x^2 = 4 \implies x = \pm 2$.<br>Таким образом, парабола пересекает ось $Ox$ в точках $(-2, 0)$ и $(2, 0)$.<br>Искомая фигура — это сегмент параболы, расположенный в нижней полуплоскости.<br><strong>Ответ:</strong> Фигура, ограниченная отрезком оси $Ox$ от точки $(-2, 0)$ до точки $(2, 0)$ и дугой параболы $y = x^2 - 4$, соединяющей эти точки.</p><p><strong>в)</strong></p><p>Рассмотрим систему неравенств: $$ \begin{cases} x^2 + y^2 \le 4, \\ y \ge -1. \end{cases} $$ Первое неравенство $x^2 + y^2 \le 4$ задает круг с центром в начале координат $(0, 0)$ и радиусом $R=2$, включая его границу — окружность $x^2 + y^2 = 2^2$.<br>Второе неравенство $y \ge -1$ задает все точки координатной плоскости, которые лежат на прямой $y = -1$ и выше нее.<br>Решением системы является пересечение этих двух множеств. Это часть круга, которая отсекается снизу прямой $y = -1$.<br>Найдем точки пересечения окружности $x^2 + y^2 = 4$ и прямой $y = -1$:<br>$x^2 + (-1)^2 = 4 \implies x^2 + 1 = 4 \implies x^2 = 3 \implies x = \pm\sqrt{3}$.<br>Точки пересечения: $(-\sqrt{3}, -1)$ и $(\sqrt{3}, -1)$.<br>Искомая фигура — это сегмент круга.<br><strong>Ответ:</strong> Сегмент круга с центром в $(0, 0)$ и радиусом 2, ограниченный снизу хордой, соединяющей точки $(-\sqrt{3}, -1)$ и $(\sqrt{3}, -1)$, и расположенный выше этой хорды.</p><p><strong>г)</strong></p><p>Рассмотрим систему неравенств: $$ \begin{cases} (x-1)^2 + (y-2)^2 \le 4, \\ x \ge 1. \end{cases} $$ Первое неравенство $(x-1)^2 + (y-2)^2 \le 4$ задает круг с центром в точке $(1, 2)$ и радиусом $R=2$, включая его границу — окружность $(x-1)^2 + (y-2)^2 = 2^2$.<br>Второе неравенство $x \ge 1$ задает все точки координатной плоскости, которые лежат на прямой $x = 1$ и правее нее.<br>Решением системы является пересечение этих двух множеств. Прямая $x = 1$ проходит через центр круга $(1, 2)$, являясь его диаметром. Неравенство $x \ge 1$ отсекает ровно правую половину круга.<br>Таким образом, искомая фигура — это правый полукруг.<br>Найдем концы диаметра, лежащего на прямой $x=1$:<br>$(1-1)^2 + (y-2)^2 = 4 \implies (y-2)^2 = 4 \implies y-2 = \pm 2$.<br>Отсюда $y = 4$ или $y = 0$. Концы диаметра — точки $(1, 0)$ и $(1, 4)$.<br><strong>Ответ:</strong> Правый полукруг, ограниченный диаметром, соединяющим точки $(1, 0)$ и $(1, 4)$, и правой дугой окружности $(x-1)^2 + (y-2)^2 = 4$.</p>"
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            "text" => "<p><strong>а)</strong></p><p>Рассмотрим систему неравенств: $$ \begin{cases} y \ge 0, \\ y \le 3 - x^2. \end{cases} $$ Первое неравенство $y \ge 0$ задает все точки координатной плоскости, которые лежат на оси $Ox$ и выше нее (верхняя полуплоскость).<br>Второе неравенство $y \le 3 - x^2$ задает все точки, которые лежат на параболе $y = 3 - x^2$ и ниже нее. Графиком функции $y = 3 - x^2$ является парабола, ветви которой направлены вниз, а вершина находится в точке $(0, 3)$.<br>Решением системы является пересечение этих двух областей. Это фигура, ограниченная снизу осью абсцисс ($y=0$), а сверху — параболой $y = 3 - x^2$.<br>Найдем точки пересечения параболы с осью $Ox$:<br>$3 - x^2 = 0 \implies x^2 = 3 \implies x = \pm\sqrt{3}$.<br>Таким образом, парабола пересекает ось $Ox$ в точках $(-\sqrt{3}, 0)$ и $(\sqrt{3}, 0)$.<br>Искомая фигура — это сегмент параболы, расположенный в верхней полуплоскости.<br><strong>Ответ:</strong> Фигура, ограниченная отрезком оси $Ox$ от точки $(-\sqrt{3}, 0)$ до точки $(\sqrt{3}, 0)$ и дугой параболы $y = 3 - x^2$, соединяющей эти точки.</p><p><strong>б)</strong></p><p>Рассмотрим систему неравенств: $$ \begin{cases} y \le 0, \\ y \ge x^2 - 4. \end{cases} $$ Первое неравенство $y \le 0$ задает все точки координатной плоскости, которые лежат на оси $Ox$ и ниже нее (нижняя полуплоскость).<br>Второе неравенство $y \ge x^2 - 4$ задает все точки, которые лежат на параболе $y = x^2 - 4$ и выше нее. Графиком функции $y = x^2 - 4$ является парабола, ветви которой направлены вверх, а вершина находится в точке $(0, -4)$.<br>Решением системы является пересечение этих двух областей. Это фигура, ограниченная сверху осью абсцисс ($y=0$), а снизу — параболой $y = x^2 - 4$.<br>Найдем точки пересечения параболы с осью $Ox$:<br>$x^2 - 4 = 0 \implies x^2 = 4 \implies x = \pm 2$.<br>Таким образом, парабола пересекает ось $Ox$ в точках $(-2, 0)$ и $(2, 0)$.<br>Искомая фигура — это сегмент параболы, расположенный в нижней полуплоскости.<br><strong>Ответ:</strong> Фигура, ограниченная отрезком оси $Ox$ от точки $(-2, 0)$ до точки $(2, 0)$ и дугой параболы $y = x^2 - 4$, соединяющей эти точки.</p><p><strong>в)</strong></p><p>Рассмотрим систему неравенств: $$ \begin{cases} x^2 + y^2 \le 4, \\ y \ge -1. \end{cases} $$ Первое неравенство $x^2 + y^2 \le 4$ задает круг с центром в начале координат $(0, 0)$ и радиусом $R=2$, включая его границу — окружность $x^2 + y^2 = 2^2$.<br>Второе неравенство $y \ge -1$ задает все точки координатной плоскости, которые лежат на прямой $y = -1$ и выше нее.<br>Решением системы является пересечение этих двух множеств. Это часть круга, которая отсекается снизу прямой $y = -1$.<br>Найдем точки пересечения окружности $x^2 + y^2 = 4$ и прямой $y = -1$:<br>$x^2 + (-1)^2 = 4 \implies x^2 + 1 = 4 \implies x^2 = 3 \implies x = \pm\sqrt{3}$.<br>Точки пересечения: $(-\sqrt{3}, -1)$ и $(\sqrt{3}, -1)$.<br>Искомая фигура — это сегмент круга.<br><strong>Ответ:</strong> Сегмент круга с центром в $(0, 0)$ и радиусом 2, ограниченный снизу хордой, соединяющей точки $(-\sqrt{3}, -1)$ и $(\sqrt{3}, -1)$, и расположенный выше этой хорды.</p><p><strong>г)</strong></p><p>Рассмотрим систему неравенств: $$ \begin{cases} (x-1)^2 + (y-2)^2 \le 4, \\ x \ge 1. \end{cases} $$ Первое неравенство $(x-1)^2 + (y-2)^2 \le 4$ задает круг с центром в точке $(1, 2)$ и радиусом $R=2$, включая его границу — окружность $(x-1)^2 + (y-2)^2 = 2^2$.<br>Второе неравенство $x \ge 1$ задает все точки координатной плоскости, которые лежат на прямой $x = 1$ и правее нее.<br>Решением системы является пересечение этих двух множеств. Прямая $x = 1$ проходит через центр круга $(1, 2)$, являясь его диаметром. Неравенство $x \ge 1$ отсекает ровно правую половину круга.<br>Таким образом, искомая фигура — это правый полукруг.<br>Найдем концы диаметра, лежащего на прямой $x=1$:<br>$(1-1)^2 + (y-2)^2 = 4 \implies (y-2)^2 = 4 \implies y-2 = \pm 2$.<br>Отсюда $y = 4$ или $y = 0$. Концы диаметра — точки $(1, 0)$ и $(1, 4)$.<br><strong>Ответ:</strong> Правый полукруг, ограниченный диаметром, соединяющим точки $(1, 0)$ и $(1, 4)$, и правой дугой окружности $(x-1)^2 + (y-2)^2 = 4$.</p>"
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                    "created_at" => "2026-04-10 13:58:26"
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                }
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                  #table: "terms"
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                    "created_at" => "2026-04-10 13:58:26"
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                    0 => "*"
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                }
                2 => App\Models\Term {#1175
                  #connection: "mysql"
                  #table: "terms"
                  #primaryKey: "id"
                  #keyType: "int"
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                  #withCount: []
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                    "created_at" => "2026-04-10 13:58:26"
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                    "field_foreign_lang_patronymic" => null
                    "field_foreign_lang_surname" => null
                    "field_name" => "Аманбала"
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            }
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              #items: array:1 [
                0 => App\Models\Term {#1180
                  #connection: "mysql"
                  #table: "terms"
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                    "created_at" => "2026-04-10 13:58:26"
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            "field_country" => Illuminate\Database\Eloquent\Collection {#1178
              #items: array:1 [
                0 => App\Models\Term {#1181
                  #connection: "mysql"
                  #table: "terms"
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                    "created_at" => "2026-04-10 13:58:26"
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                    "field_translit" => "kazakhstan"
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                    "created_at" => "2026-04-10 13:58:26"
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            "field_city" => Illuminate\Database\Eloquent\Collection {#1179
              #items: array:1 [
                0 => App\Models\Term {#1209
                  #connection: "mysql"
                  #table: "terms"
                  #primaryKey: "id"
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                  #attributes: array:6 [
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                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
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                    "field_cases" => array:6 [ …6]
                    "field_translit" => "almaty"
                  ]
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                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
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                    "field_translit" => "almaty"
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              ]
              #escapeWhenCastingToString: false
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            "field_series" => Illuminate\Database\Eloquent\Collection {#1210
              #items: []
              #escapeWhenCastingToString: false
            }
            "field_umk" => Illuminate\Database\Eloquent\Collection {#1212
              #items: []
              #escapeWhenCastingToString: false
            }
            "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1213
              #items: []
              #escapeWhenCastingToString: false
            }
            "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1214
              #items: []
              #escapeWhenCastingToString: false
            }
            "field_publication_number" => null
            "field_publication_type" => Illuminate\Database\Eloquent\Collection {#1215
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              #escapeWhenCastingToString: false
            }
            "field_under_the_edition" => Illuminate\Database\Eloquent\Collection {#1216
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              #escapeWhenCastingToString: false
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            "field_part" => ""
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            }
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              #escapeWhenCastingToString: false
            }
            "field_old_book" => Illuminate\Database\Eloquent\Collection {#1219
              #items: []
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            }
            "field_url" => "/9-klass/algebra/kokshetau-soltan-uchebnik"
            "field_cover_color" => Illuminate\Database\Eloquent\Collection {#1220
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            "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1214}
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      ]
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    "page" => Illuminate\Database\Eloquent\Collection {#1763
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        0 => App\Models\BookPage {#1032
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          #primaryKey: "id"
          #keyType: "int"
          +incrementing: true
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          #attributes: array:21 [
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            }
            "field_weight" => "0"
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              #items: array:1 [
                0 => App\Models\Book {#1221
                  #connection: "mysql"
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                    "field_subject" => Illuminate\Database\Eloquent\Collection {#1222 …2}
                    "field_class" => Illuminate\Database\Eloquent\Collection {#1225 …2}
                    "field_publisher" => Illuminate\Database\Eloquent\Collection {#1227 …2}
                    "field_author" => Illuminate\Database\Eloquent\Collection {#1229 …2}
                    "field_author_foreign" => Illuminate\Database\Eloquent\Collection {#1233 …2}
                    "field_book_type" => Illuminate\Database\Eloquent\Collection {#1234 …2}
                    "field_country" => Illuminate\Database\Eloquent\Collection {#1236 …2}
                    "field_city" => Illuminate\Database\Eloquent\Collection {#1238 …2}
                    "field_series" => Illuminate\Database\Eloquent\Collection {#1240 …2}
                    "field_umk" => Illuminate\Database\Eloquent\Collection {#1241 …2}
                    "field_level_of_education" => Illuminate\Database\Eloquent\Collection {#1242 …2}
                    "field_standart_of_education" => Illuminate\Database\Eloquent\Collection {#1243 …2}
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                    "field_cover_description" => null
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                    "field_for_whom" => "Учебник для учащихся 9 класса общеобразовательных школ"
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                    "field_reserve_field" => null
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                    "field_default_folder" => "/algebra_09/soltan-u19/"
                    "field_isbn" => "978-601-317-424-2"
                    "field_cover" => array:1 [ …1]
                    "field_cover_alts" => array:1 [ …1]
                    "field_covers" => array:1 [ …1]
                    "field_popular_book" => null
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№145 (с. 49)
Условие. №145 (с. 49)
скриншот условия
Алгебра, 9 класс Учебник, авторы: Солтан Генадий Николаевич, Солтан Алла Евгеньевна, Жумадилова Аманбала Жумадиловна, издательство Кокшетау, Алматы, 2019, страница 49, номер 145, Условие

145. Постройте в координатной плоскости фигуру, координаты каждой точки которой являются решениями системы неравенств:

а) $ \begin{cases} y \ge 0, \\ y \le 3 - x^2; \end{cases} $

б) $ \begin{cases} y \le 0, \\ y \ge x^2 - 4; \end{cases} $

в) $ \begin{cases} x^2 + y^2 \le 4, \\ y \ge -1; \end{cases} $

г) $ \begin{cases} (x-1)^2 + (y-2)^2 \le 4, \\ x \ge 1. \end{cases} $

Решение. №145 (с. 49)
Алгебра, 9 класс Учебник, авторы: Солтан Генадий Николаевич, Солтан Алла Евгеньевна, Жумадилова Аманбала Жумадиловна, издательство Кокшетау, Алматы, 2019, страница 49, номер 145, Решение
Решение 2 (rus). №145 (с. 49)

а)

Рассмотрим систему неравенств: $$ \begin{cases} y \ge 0, \\ y \le 3 - x^2. \end{cases} $$ Первое неравенство $y \ge 0$ задает все точки координатной плоскости, которые лежат на оси $Ox$ и выше нее (верхняя полуплоскость).
Второе неравенство $y \le 3 - x^2$ задает все точки, которые лежат на параболе $y = 3 - x^2$ и ниже нее. Графиком функции $y = 3 - x^2$ является парабола, ветви которой направлены вниз, а вершина находится в точке $(0, 3)$.
Решением системы является пересечение этих двух областей. Это фигура, ограниченная снизу осью абсцисс ($y=0$), а сверху — параболой $y = 3 - x^2$.
Найдем точки пересечения параболы с осью $Ox$:
$3 - x^2 = 0 \implies x^2 = 3 \implies x = \pm\sqrt{3}$.
Таким образом, парабола пересекает ось $Ox$ в точках $(-\sqrt{3}, 0)$ и $(\sqrt{3}, 0)$.
Искомая фигура — это сегмент параболы, расположенный в верхней полуплоскости.
Ответ: Фигура, ограниченная отрезком оси $Ox$ от точки $(-\sqrt{3}, 0)$ до точки $(\sqrt{3}, 0)$ и дугой параболы $y = 3 - x^2$, соединяющей эти точки.

б)

Рассмотрим систему неравенств: $$ \begin{cases} y \le 0, \\ y \ge x^2 - 4. \end{cases} $$ Первое неравенство $y \le 0$ задает все точки координатной плоскости, которые лежат на оси $Ox$ и ниже нее (нижняя полуплоскость).
Второе неравенство $y \ge x^2 - 4$ задает все точки, которые лежат на параболе $y = x^2 - 4$ и выше нее. Графиком функции $y = x^2 - 4$ является парабола, ветви которой направлены вверх, а вершина находится в точке $(0, -4)$.
Решением системы является пересечение этих двух областей. Это фигура, ограниченная сверху осью абсцисс ($y=0$), а снизу — параболой $y = x^2 - 4$.
Найдем точки пересечения параболы с осью $Ox$:
$x^2 - 4 = 0 \implies x^2 = 4 \implies x = \pm 2$.
Таким образом, парабола пересекает ось $Ox$ в точках $(-2, 0)$ и $(2, 0)$.
Искомая фигура — это сегмент параболы, расположенный в нижней полуплоскости.
Ответ: Фигура, ограниченная отрезком оси $Ox$ от точки $(-2, 0)$ до точки $(2, 0)$ и дугой параболы $y = x^2 - 4$, соединяющей эти точки.

в)

Рассмотрим систему неравенств: $$ \begin{cases} x^2 + y^2 \le 4, \\ y \ge -1. \end{cases} $$ Первое неравенство $x^2 + y^2 \le 4$ задает круг с центром в начале координат $(0, 0)$ и радиусом $R=2$, включая его границу — окружность $x^2 + y^2 = 2^2$.
Второе неравенство $y \ge -1$ задает все точки координатной плоскости, которые лежат на прямой $y = -1$ и выше нее.
Решением системы является пересечение этих двух множеств. Это часть круга, которая отсекается снизу прямой $y = -1$.
Найдем точки пересечения окружности $x^2 + y^2 = 4$ и прямой $y = -1$:
$x^2 + (-1)^2 = 4 \implies x^2 + 1 = 4 \implies x^2 = 3 \implies x = \pm\sqrt{3}$.
Точки пересечения: $(-\sqrt{3}, -1)$ и $(\sqrt{3}, -1)$.
Искомая фигура — это сегмент круга.
Ответ: Сегмент круга с центром в $(0, 0)$ и радиусом 2, ограниченный снизу хордой, соединяющей точки $(-\sqrt{3}, -1)$ и $(\sqrt{3}, -1)$, и расположенный выше этой хорды.

г)

Рассмотрим систему неравенств: $$ \begin{cases} (x-1)^2 + (y-2)^2 \le 4, \\ x \ge 1. \end{cases} $$ Первое неравенство $(x-1)^2 + (y-2)^2 \le 4$ задает круг с центром в точке $(1, 2)$ и радиусом $R=2$, включая его границу — окружность $(x-1)^2 + (y-2)^2 = 2^2$.
Второе неравенство $x \ge 1$ задает все точки координатной плоскости, которые лежат на прямой $x = 1$ и правее нее.
Решением системы является пересечение этих двух множеств. Прямая $x = 1$ проходит через центр круга $(1, 2)$, являясь его диаметром. Неравенство $x \ge 1$ отсекает ровно правую половину круга.
Таким образом, искомая фигура — это правый полукруг.
Найдем концы диаметра, лежащего на прямой $x=1$:
$(1-1)^2 + (y-2)^2 = 4 \implies (y-2)^2 = 4 \implies y-2 = \pm 2$.
Отсюда $y = 4$ или $y = 0$. Концы диаметра — точки $(1, 0)$ и $(1, 4)$.
Ответ: Правый полукруг, ограниченный диаметром, соединяющим точки $(1, 0)$ и $(1, 4)$, и правой дугой окружности $(x-1)^2 + (y-2)^2 = 4$.

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