Номер 51, страница 74, 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. Глава 5. Производная. Параграф 3. Физический и геометрический смысл производной. 3.2. Касательная к графику функции. Задачи - номер 51, страница 74.

App\Models\Task {#1030 // resources/views/models/task/default.blade.php
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    "field_task_type" => Illuminate\Database\Eloquent\Collection {#1037
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        0 => App\Models\Term {#1036
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    "parent_branches" => Illuminate\Database\Eloquent\Collection {#1106
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        2 => App\Models\Branch {#1127
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                0 => App\Models\Branch {#1138
                  #connection: "mysql"
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                    "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1140 …2}
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                    "book" => Illuminate\Database\Eloquent\Collection {#1141 …2}
                    "branch_parent" => Illuminate\Database\Eloquent\Collection {#1142 …2}
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          ]
        }
        3 => App\Models\Branch {#1132
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          #table: "branches"
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            "book" => Illuminate\Database\Eloquent\Collection {#1135
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              ]
              #escapeWhenCastingToString: false
            }
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1148
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                0 => App\Models\Branch {#1147
                  #connection: "mysql"
                  #table: "branches"
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                    "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1149 …2}
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                    "book" => Illuminate\Database\Eloquent\Collection {#1150 …2}
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            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1129}
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          ]
        }
        4 => App\Models\Branch {#1136
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          #table: "branches"
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          #keyType: "int"
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          #attributes: array:24 [
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            "created_at" => "2026-04-10 13:58:26"
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            "field_display_title" => "Задачи"
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            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1133
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            "field_page_start" => "70"
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            "book" => Illuminate\Database\Eloquent\Collection {#1144
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              ]
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            }
            "branch_parent" => Illuminate\Database\Eloquent\Collection {#1157
              #items: array:1 [
                0 => App\Models\Branch {#1156
                  #connection: "mysql"
                  #table: "branches"
                  #primaryKey: "id"
                  #keyType: "int"
                  +incrementing: true
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                    "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1158 …2}
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                    "book" => Illuminate\Database\Eloquent\Collection {#1159 …2}
                    "branch_parent" => Illuminate\Database\Eloquent\Collection {#1160 …2}
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          ]
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      ]
      #escapeWhenCastingToString: false
    }
    "content" => Illuminate\Database\Eloquent\Collection {#1038
      #items: array:2 [
        0 => App\Models\Element {#1098
          #connection: "mysql"
          #table: "elements"
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          #keyType: "int"
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            "id" => 1300994
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            "edition" => Illuminate\Database\Eloquent\Collection {#1089
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                0 => App\Models\Edition {#1088
                  #connection: "mysql"
                  #table: "editions"
                  #primaryKey: "id"
                  #keyType: "int"
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                  #attributes: array:21 [
                    "id" => 4962
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "title" => "Условие"
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                    "field_publisher" => Illuminate\Database\Eloquent\Collection {#1085 …2}
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                    "field_content_mode" => "text, image"
                    "field_page_content_mode" => "image"
                    "field_content_text_checked" => null
                    "field_page_content_text_checked" => "0"
                    "field_solution_author" => "Автор"
                    "field_moderator" => "pasha"
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                    "field_root_dir" => "0-"
                    "field_responsible" => Illuminate\Database\Eloquent\Collection {#1078 …2}
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                  ]
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                    0 => "*"
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              ]
              #escapeWhenCastingToString: false
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            "task" => array:2 [
              "refs" => "1120309"
              "type" => "task"
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            "text" => "<p><strong>51.</strong> (3)</p><p>К графику функции $y=3x-x^2$ проведены две касательные. Первая касательная проведена в точке на графике с абсциссой $x_0=2$, вторая в точке максимума данной функции. Найдите площадь треугольника, образованного осью ординат и этими касательными.</p>"
            "img" => array:1 [
              0 => array:5 [
                "name" => "51-1.jpg"
                "alt" => null
                "width" => "1693"
                "height" => 321
                "path" => "/media/algebra_10/baspasy-u19/0-5-3-2zad/51-1.webp?ts=1753534877"
              ]
            ]
          ]
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            "id" => 1300994
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "edition" => Illuminate\Database\Eloquent\Collection {#1089}
            "task" => array:2 [
              "refs" => "1120309"
              "type" => "task"
            ]
            "text" => "<p><strong>51.</strong> (3)</p><p>К графику функции $y=3x-x^2$ проведены две касательные. Первая касательная проведена в точке на графике с абсциссой $x_0=2$, вторая в точке максимума данной функции. Найдите площадь треугольника, образованного осью ординат и этими касательными.</p>"
            "img" => array:1 [
              0 => array:5 [
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                "path" => "/media/algebra_10/baspasy-u19/0-5-3-2zad/51-1.webp?ts=1753534877"
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            0 => "*"
          ]
        }
        1 => App\Models\Element {#1096
          #connection: "mysql"
          #table: "elements"
          #primaryKey: "id"
          #keyType: "int"
          +incrementing: true
          #with: []
          #withCount: []
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          #perPage: 15
          +exists: true
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          #attributes: array:6 [
            "id" => 1552030
            "created_at" => "2026-04-10 13:58:26"
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            "edition" => Illuminate\Database\Eloquent\Collection {#1080
              #items: array:1 [
                0 => App\Models\Edition {#1095
                  #connection: "mysql"
                  #table: "editions"
                  #primaryKey: "id"
                  #keyType: "int"
                  +incrementing: false
                  #with: []
                  #withCount: []
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                  #perPage: 15
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                  #attributes: array:21 [
                    "id" => 5659
                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "title" => "Решение 2 (rus)"
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                    "field_publisher" => Illuminate\Database\Eloquent\Collection {#1093 …2}
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                    "field_solution_author" => "Gemini 2.5 Pro"
                    "field_moderator" => "tolik"
                    "field_edition_type" => "solution"
                    "field_root_dir" => "2-"
                    "field_responsible" => Illuminate\Database\Eloquent\Collection {#1094 …2}
                    "field_comment" => null
                    "field_similar_book" => Illuminate\Database\Eloquent\Collection {#1090 …2}
                    "field_process_formula" => "katex"
                    "field_edition_group" => Illuminate\Database\Eloquent\Collection {#1092 …2}
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                  ]
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                    "created_at" => "2026-04-10 13:58:26"
                    "updated_at" => null
                    "title" => "Решение 2 (rus)"
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            "text" => "<p><strong>Первая касательная, проведенная в точке на графике с абсциссой $x_0=2$</strong></p><p>Для нахождения уравнения касательной используется формула $y = f(x_0) + f'(x_0)(x - x_0)$.<br>Дана функция $f(x) = y = 3x - x^2$.<br>Найдем ее производную: $f'(x) = (3x - x^2)' = 3 - 2x$.<br>Первая касательная проведена в точке с абсциссой $x_0 = 2$. Вычислим значение функции и ее производной в этой точке:<br>$f(2) = 3 \cdot 2 - 2^2 = 6 - 4 = 2$.<br>$f'(2) = 3 - 2 \cdot 2 = 3 - 4 = -1$.<br>Подставим найденные значения в формулу касательной:<br>$y = 2 + (-1)(x - 2) = 2 - x + 2 = 4 - x$.<br>Уравнение первой касательной: $y = -x + 4$.</p><p><strong>Вторая касательная, проведенная в точке максимума данной функции</strong></p><p>Чтобы найти точку максимума, необходимо найти точку, в которой производная функции равна нулю:<br>$f'(x) = 0 \implies 3 - 2x = 0 \implies 2x = 3 \implies x_{max} = 1.5$.<br>Это абсцисса точки касания для второй касательной. Найдем ординату этой точки:<br>$f(1.5) = 3 \cdot 1.5 - (1.5)^2 = 4.5 - 2.25 = 2.25$.<br>Значение производной в точке максимума равно нулю, $f'(1.5) = 0$. Это означает, что касательная является горизонтальной прямой.<br>Ее уравнение: $y = 2.25$.</p><p><strong>Площадь треугольника, образованного осью ординат и этими касательными</strong></p><p>Треугольник образован тремя прямыми: первой касательной $y = -x + 4$, второй касательной $y = 2.25$ и осью ординат, уравнение которой $x = 0$.<br>Найдем вершины этого треугольника как точки пересечения этих прямых:<br>1. Пересечение двух касательных:$ -x + 4 = 2.25 \implies x = 4 - 2.25 = 1.75$.Координаты первой вершины: $(1.75, 2.25)$.<br>2. Пересечение первой касательной с осью ординат ($x=0$):$y = -0 + 4 = 4$.Координаты второй вершины: $(0, 4)$.<br>3. Пересечение второй касательной с осью ординат ($x=0$):$y = 2.25$.Координаты третьей вершины: $(0, 2.25)$.<br>Основание треугольника лежит на оси ординат, его длина равна модулю разности ординат второй и третьей вершин:<br>$a = |4 - 2.25| = 1.75$.<br>Высота треугольника, проведенная к этому основанию, равна абсциссе первой вершины:<br>$h = 1.75$.<br>Площадь треугольника вычисляется по формуле $S = \frac{1}{2} a \cdot h$:<br>$S = \frac{1}{2} \cdot 1.75 \cdot 1.75 = \frac{1}{2} \cdot (\frac{7}{4})^2 = \frac{1}{2} \cdot \frac{49}{16} = \frac{49}{32}$.</p><p><strong>Ответ:</strong> $\frac{49}{32}$</p>"
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            "text" => "<p><strong>Первая касательная, проведенная в точке на графике с абсциссой $x_0=2$</strong></p><p>Для нахождения уравнения касательной используется формула $y = f(x_0) + f'(x_0)(x - x_0)$.<br>Дана функция $f(x) = y = 3x - x^2$.<br>Найдем ее производную: $f'(x) = (3x - x^2)' = 3 - 2x$.<br>Первая касательная проведена в точке с абсциссой $x_0 = 2$. Вычислим значение функции и ее производной в этой точке:<br>$f(2) = 3 \cdot 2 - 2^2 = 6 - 4 = 2$.<br>$f'(2) = 3 - 2 \cdot 2 = 3 - 4 = -1$.<br>Подставим найденные значения в формулу касательной:<br>$y = 2 + (-1)(x - 2) = 2 - x + 2 = 4 - x$.<br>Уравнение первой касательной: $y = -x + 4$.</p><p><strong>Вторая касательная, проведенная в точке максимума данной функции</strong></p><p>Чтобы найти точку максимума, необходимо найти точку, в которой производная функции равна нулю:<br>$f'(x) = 0 \implies 3 - 2x = 0 \implies 2x = 3 \implies x_{max} = 1.5$.<br>Это абсцисса точки касания для второй касательной. Найдем ординату этой точки:<br>$f(1.5) = 3 \cdot 1.5 - (1.5)^2 = 4.5 - 2.25 = 2.25$.<br>Значение производной в точке максимума равно нулю, $f'(1.5) = 0$. Это означает, что касательная является горизонтальной прямой.<br>Ее уравнение: $y = 2.25$.</p><p><strong>Площадь треугольника, образованного осью ординат и этими касательными</strong></p><p>Треугольник образован тремя прямыми: первой касательной $y = -x + 4$, второй касательной $y = 2.25$ и осью ординат, уравнение которой $x = 0$.<br>Найдем вершины этого треугольника как точки пересечения этих прямых:<br>1. Пересечение двух касательных:$ -x + 4 = 2.25 \implies x = 4 - 2.25 = 1.75$.Координаты первой вершины: $(1.75, 2.25)$.<br>2. Пересечение первой касательной с осью ординат ($x=0$):$y = -0 + 4 = 4$.Координаты второй вершины: $(0, 4)$.<br>3. Пересечение второй касательной с осью ординат ($x=0$):$y = 2.25$.Координаты третьей вершины: $(0, 2.25)$.<br>Основание треугольника лежит на оси ординат, его длина равна модулю разности ординат второй и третьей вершин:<br>$a = |4 - 2.25| = 1.75$.<br>Высота треугольника, проведенная к этому основанию, равна абсциссе первой вершины:<br>$h = 1.75$.<br>Площадь треугольника вычисляется по формуле $S = \frac{1}{2} a \cdot h$:<br>$S = \frac{1}{2} \cdot 1.75 \cdot 1.75 = \frac{1}{2} \cdot (\frac{7}{4})^2 = \frac{1}{2} \cdot \frac{49}{16} = \frac{49}{32}$.</p><p><strong>Ответ:</strong> $\frac{49}{32}$</p>"
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№51 (с. 74)
Условие. №51 (с. 74)
скриншот условия
Алгебра, 10 класс Учебник, авторы: Пак Олег Владимирович, Ардакулы Дархан, Ескендирова Елена Викторовна, издательство Алматыкітап баспасы, Алматы, 2019, Часть 2, страница 74, номер 51, Условие

51. (3)

К графику функции $y=3x-x^2$ проведены две касательные. Первая касательная проведена в точке на графике с абсциссой $x_0=2$, вторая в точке максимума данной функции. Найдите площадь треугольника, образованного осью ординат и этими касательными.

Решение 2 (rus). №51 (с. 74)

Первая касательная, проведенная в точке на графике с абсциссой $x_0=2$

Для нахождения уравнения касательной используется формула $y = f(x_0) + f'(x_0)(x - x_0)$.
Дана функция $f(x) = y = 3x - x^2$.
Найдем ее производную: $f'(x) = (3x - x^2)' = 3 - 2x$.
Первая касательная проведена в точке с абсциссой $x_0 = 2$. Вычислим значение функции и ее производной в этой точке:
$f(2) = 3 \cdot 2 - 2^2 = 6 - 4 = 2$.
$f'(2) = 3 - 2 \cdot 2 = 3 - 4 = -1$.
Подставим найденные значения в формулу касательной:
$y = 2 + (-1)(x - 2) = 2 - x + 2 = 4 - x$.
Уравнение первой касательной: $y = -x + 4$.

Вторая касательная, проведенная в точке максимума данной функции

Чтобы найти точку максимума, необходимо найти точку, в которой производная функции равна нулю:
$f'(x) = 0 \implies 3 - 2x = 0 \implies 2x = 3 \implies x_{max} = 1.5$.
Это абсцисса точки касания для второй касательной. Найдем ординату этой точки:
$f(1.5) = 3 \cdot 1.5 - (1.5)^2 = 4.5 - 2.25 = 2.25$.
Значение производной в точке максимума равно нулю, $f'(1.5) = 0$. Это означает, что касательная является горизонтальной прямой.
Ее уравнение: $y = 2.25$.

Площадь треугольника, образованного осью ординат и этими касательными

Треугольник образован тремя прямыми: первой касательной $y = -x + 4$, второй касательной $y = 2.25$ и осью ординат, уравнение которой $x = 0$.
Найдем вершины этого треугольника как точки пересечения этих прямых:
1. Пересечение двух касательных:$ -x + 4 = 2.25 \implies x = 4 - 2.25 = 1.75$.Координаты первой вершины: $(1.75, 2.25)$.
2. Пересечение первой касательной с осью ординат ($x=0$):$y = -0 + 4 = 4$.Координаты второй вершины: $(0, 4)$.
3. Пересечение второй касательной с осью ординат ($x=0$):$y = 2.25$.Координаты третьей вершины: $(0, 2.25)$.
Основание треугольника лежит на оси ординат, его длина равна модулю разности ординат второй и третьей вершин:
$a = |4 - 2.25| = 1.75$.
Высота треугольника, проведенная к этому основанию, равна абсциссе первой вершины:
$h = 1.75$.
Площадь треугольника вычисляется по формуле $S = \frac{1}{2} a \cdot h$:
$S = \frac{1}{2} \cdot 1.75 \cdot 1.75 = \frac{1}{2} \cdot (\frac{7}{4})^2 = \frac{1}{2} \cdot \frac{49}{16} = \frac{49}{32}$.

Ответ: $\frac{49}{32}$

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