Номер 340, страница 100 - 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

III. Последовательности. 13. Числовая последовательность, способы ее задания и свойства - номер 340, страница 100.

App\Models\Task {#1024 // resources/views/models/task/default.blade.php
  #connection: "mysql"
  #table: "tasks"
  #primaryKey: "id"
  #keyType: "int"
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  #attributes: array:24 [
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    "field_outside_task" => null
    "field_task_type" => Illuminate\Database\Eloquent\Collection {#331
      #items: array:1 [
        0 => App\Models\Term {#1029
          #connection: "mysql"
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          #attributes: array:6 [
            "id" => 26
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            "updated_at" => null
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          ]
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      #items: []
      #escapeWhenCastingToString: false
    }
    "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#342
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        0 => App\Models\Branch {#1023
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          #table: "branches"
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          #keyType: "int"
          +incrementing: true
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            "created_at" => "2026-04-10 13:58:26"
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              #items: array:1 [
                0 => App\Models\Book {#1030
                  #connection: "mysql"
                  #table: "books"
                  #primaryKey: "id"
                  #keyType: "int"
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                  #withCount: []
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                  #attributes: array:50 [
                    "id" => 4298
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                        0 => App\Models\Term {#1034
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                          #primaryKey: "id"
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                            "created_at" => "2026-04-10 13:58:26"
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                    "field_class" => Illuminate\Database\Eloquent\Collection {#1035
                      #items: array:1 [
                        0 => App\Models\Term {#1036
                          #connection: "mysql"
                          #table: "terms"
                          #primaryKey: "id"
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                          #attributes: array:6 [
                            "id" => 5458
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
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                        0 => App\Models\Term {#1038
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                            "created_at" => "2026-04-10 13:58:26"
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                    "field_author" => Illuminate\Database\Eloquent\Collection {#1039
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                        0 => App\Models\Term {#1040
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                        1 => App\Models\Term {#1041
                          #connection: "mysql"
                          #table: "terms"
                          #primaryKey: "id"
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                          #connection: "mysql"
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            "text" => "<p><strong>а)</strong> Чтобы найти, на сколько сотый член последовательности больше $\frac{4}{5}$, сначала найдем значение сотого члена $x_{100}$.</p><p>Подставим $n=100$ в формулу $x_n = \frac{4n + 1}{5n}$:</p><p>$x_{100} = \frac{4 \cdot 100 + 1}{5 \cdot 100} = \frac{400 + 1}{500} = \frac{401}{500}$.</p><p>Теперь найдем разность между $x_{100}$ и числом $\frac{4}{5}$:</p><p>$x_{100} - \frac{4}{5} = \frac{401}{500} - \frac{4}{5}$.</p><p>Приведем дробь $\frac{4}{5}$ к общему знаменателю 500:</p><p>$\frac{4}{5} = \frac{4 \cdot 100}{5 \cdot 100} = \frac{400}{500}$.</p><p>Вычислим разность:</p><p>$\frac{401}{500} - \frac{400}{500} = \frac{1}{500}$.</p><p>Таким образом, сотый член последовательности больше $\frac{4}{5}$ на $\frac{1}{500}$.</p><p><strong>Ответ:</strong> на $\frac{1}{500}$.</p><p><strong>б)</strong> Чтобы найти, при каких $n$ верно неравенство $x_n - \frac{4}{5} &lt; 10^{-3}$, сначала упростим выражение в левой части неравенства.</p><p>$x_n - \frac{4}{5} = \frac{4n + 1}{5n} - \frac{4}{5} = \frac{4n + 1}{5n} - \frac{4n}{5n} = \frac{4n + 1 - 4n}{5n} = \frac{1}{5n}$.</p><p>Теперь необходимо решить неравенство:</p><p>$\frac{1}{5n} &lt; 10^{-3}$.</p><p>Мы знаем, что $10^{-3} = \frac{1}{10^3} = \frac{1}{1000}$. Подставим это значение в неравенство:</p><p>$\frac{1}{5n} &lt; \frac{1}{1000}$.</p><p>Поскольку $n$ — это номер члена последовательности, $n$ является натуральным числом ($n \ge 1$), следовательно, $5n$ — положительное число. Так как обе части неравенства положительны, мы можем взять обратные величины с каждой стороны, изменив при этом знак неравенства на противоположный:</p><p>$5n &gt; 1000$.</p><p>Разделим обе части неравенства на 5:</p><p>$n &gt; \frac{1000}{5}$</p><p>$n &gt; 200$.</p><p>Неравенство верно для всех натуральных чисел $n$, которые больше 200.</p><p><strong>Ответ:</strong> при $n &gt; 200$.</p>"
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            "text" => "<p><strong>а)</strong> Чтобы найти, на сколько сотый член последовательности больше $\frac{4}{5}$, сначала найдем значение сотого члена $x_{100}$.</p><p>Подставим $n=100$ в формулу $x_n = \frac{4n + 1}{5n}$:</p><p>$x_{100} = \frac{4 \cdot 100 + 1}{5 \cdot 100} = \frac{400 + 1}{500} = \frac{401}{500}$.</p><p>Теперь найдем разность между $x_{100}$ и числом $\frac{4}{5}$:</p><p>$x_{100} - \frac{4}{5} = \frac{401}{500} - \frac{4}{5}$.</p><p>Приведем дробь $\frac{4}{5}$ к общему знаменателю 500:</p><p>$\frac{4}{5} = \frac{4 \cdot 100}{5 \cdot 100} = \frac{400}{500}$.</p><p>Вычислим разность:</p><p>$\frac{401}{500} - \frac{400}{500} = \frac{1}{500}$.</p><p>Таким образом, сотый член последовательности больше $\frac{4}{5}$ на $\frac{1}{500}$.</p><p><strong>Ответ:</strong> на $\frac{1}{500}$.</p><p><strong>б)</strong> Чтобы найти, при каких $n$ верно неравенство $x_n - \frac{4}{5} &lt; 10^{-3}$, сначала упростим выражение в левой части неравенства.</p><p>$x_n - \frac{4}{5} = \frac{4n + 1}{5n} - \frac{4}{5} = \frac{4n + 1}{5n} - \frac{4n}{5n} = \frac{4n + 1 - 4n}{5n} = \frac{1}{5n}$.</p><p>Теперь необходимо решить неравенство:</p><p>$\frac{1}{5n} &lt; 10^{-3}$.</p><p>Мы знаем, что $10^{-3} = \frac{1}{10^3} = \frac{1}{1000}$. Подставим это значение в неравенство:</p><p>$\frac{1}{5n} &lt; \frac{1}{1000}$.</p><p>Поскольку $n$ — это номер члена последовательности, $n$ является натуральным числом ($n \ge 1$), следовательно, $5n$ — положительное число. Так как обе части неравенства положительны, мы можем взять обратные величины с каждой стороны, изменив при этом знак неравенства на противоположный:</p><p>$5n &gt; 1000$.</p><p>Разделим обе части неравенства на 5:</p><p>$n &gt; \frac{1000}{5}$</p><p>$n &gt; 200$.</p><p>Неравенство верно для всех натуральных чисел $n$, которые больше 200.</p><p><strong>Ответ:</strong> при $n &gt; 200$.</p>"
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№340 (с. 100)
Условие. №340 (с. 100)
скриншот условия
Алгебра, 9 класс Учебник, авторы: Солтан Генадий Николаевич, Солтан Алла Евгеньевна, Жумадилова Аманбала Жумадиловна, издательство Кокшетау, Алматы, 2019, страница 100, номер 340, Условие

340. Последовательность ($x_n$) задана формулой $n$-го члена $x_n = \frac{4n+1}{5n}$. Найдите:

а) на сколько сотый член последовательности больше $\frac{4}{5}$;

б) при каких $n$ верно неравенство $x_n - \frac{4}{5} < 10^{-3}$.

Решение. №340 (с. 100)
Алгебра, 9 класс Учебник, авторы: Солтан Генадий Николаевич, Солтан Алла Евгеньевна, Жумадилова Аманбала Жумадиловна, издательство Кокшетау, Алматы, 2019, страница 100, номер 340, Решение
Решение 2 (rus). №340 (с. 100)

а) Чтобы найти, на сколько сотый член последовательности больше $\frac{4}{5}$, сначала найдем значение сотого члена $x_{100}$.

Подставим $n=100$ в формулу $x_n = \frac{4n + 1}{5n}$:

$x_{100} = \frac{4 \cdot 100 + 1}{5 \cdot 100} = \frac{400 + 1}{500} = \frac{401}{500}$.

Теперь найдем разность между $x_{100}$ и числом $\frac{4}{5}$:

$x_{100} - \frac{4}{5} = \frac{401}{500} - \frac{4}{5}$.

Приведем дробь $\frac{4}{5}$ к общему знаменателю 500:

$\frac{4}{5} = \frac{4 \cdot 100}{5 \cdot 100} = \frac{400}{500}$.

Вычислим разность:

$\frac{401}{500} - \frac{400}{500} = \frac{1}{500}$.

Таким образом, сотый член последовательности больше $\frac{4}{5}$ на $\frac{1}{500}$.

Ответ: на $\frac{1}{500}$.

б) Чтобы найти, при каких $n$ верно неравенство $x_n - \frac{4}{5} < 10^{-3}$, сначала упростим выражение в левой части неравенства.

$x_n - \frac{4}{5} = \frac{4n + 1}{5n} - \frac{4}{5} = \frac{4n + 1}{5n} - \frac{4n}{5n} = \frac{4n + 1 - 4n}{5n} = \frac{1}{5n}$.

Теперь необходимо решить неравенство:

$\frac{1}{5n} < 10^{-3}$.

Мы знаем, что $10^{-3} = \frac{1}{10^3} = \frac{1}{1000}$. Подставим это значение в неравенство:

$\frac{1}{5n} < \frac{1}{1000}$.

Поскольку $n$ — это номер члена последовательности, $n$ является натуральным числом ($n \ge 1$), следовательно, $5n$ — положительное число. Так как обе части неравенства положительны, мы можем взять обратные величины с каждой стороны, изменив при этом знак неравенства на противоположный:

$5n > 1000$.

Разделим обе части неравенства на 5:

$n > \frac{1000}{5}$

$n > 200$.

Неравенство верно для всех натуральных чисел $n$, которые больше 200.

Ответ: при $n > 200$.

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