Номер 5, страница 144, часть 1 - гдз по алгебре 8 класс учебник Мордкович, Александрова

Алгебра, 8 класс Учебник, авторы: Мордкович Александр Григорьевич, Александрова Лилия Александровна, Мишустина Татьяна Николаевна, Тульчинская Елена Ефимовна, Семенов Павел Владимирович, издательство Мнемозина, Москва, 2019, часть 1

Авторы: Мордкович А. Г., Александрова Л. А., Мишустина Т. Н., Тульчинская Е. Е., Семенов П. В.

Тип: Учебник

Издательство: Мнемозина

Год издания: 2019 - 2026

Часть: 1

Допущено Министерством просвещения Российской Федерации

Часть 1. Глава 4. Квадратные уравнения. Параграф 27. Основные понятия - номер 5, страница 144.

App\Models\Task {#1030 // resources/views/models/task/default.blade.php
  #connection: "mysql"
  #table: "tasks"
  #primaryKey: "id"
  #keyType: "int"
  +incrementing: true
  #with: []
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  +preventsLazyLoading: false
  #perPage: 15
  +exists: true
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  #escapeWhenCastingToString: false
  #attributes: array:24 [
    "id" => 226727
    "created_at" => "2026-04-10 13:58:26"
    "updated_at" => null
    "field_page_start" => "144"
    "field_page_end" => null
    "field_url" => "/8-klass/algebra/mordkovich/1-27-5"
    "field_display_title" => "5"
    "field_outside_task" => null
    "field_task_type" => Illuminate\Database\Eloquent\Collection {#1037
      #items: array:1 [
        0 => App\Models\Term {#1036
          #connection: "mysql"
          #table: "terms"
          #primaryKey: "id"
          #keyType: "int"
          +incrementing: false
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          #attributes: array:6 [
            "id" => 26
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
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            "field_cases" => array:6 [
              "field_accusative_case" => "номер"
              "field_creative_case" => "номером"
              "field_dative_case" => "номеру"
              "field_genitive_case" => "номера"
              "field_nominative_case" => "номер"
              "field_prepositional_case" => "номере"
            ]
            "field_short_name" => ""
          ]
          #original: array:6 [
            "id" => 26
            "created_at" => "2026-04-10 13:58:26"
            "updated_at" => null
            "name" => "номер"
            "field_cases" => array:6 [
              "field_accusative_case" => "номер"
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              "field_nominative_case" => "номер"
              "field_prepositional_case" => "номере"
            ]
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            0 => "*"
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    "field_description_bottom" => null
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    "breadcrumbs" => []
    "edition_groups" => Illuminate\Database\Eloquent\Collection {#1035
      #items: []
      #escapeWhenCastingToString: false
    }
    "top_parent_branch" => Illuminate\Database\Eloquent\Collection {#1046
      #items: array:1 [
        0 => App\Models\Branch {#1045
          #connection: "mysql"
          #table: "branches"
          #primaryKey: "id"
          #keyType: "int"
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            "id" => 226509
            "created_at" => "2026-04-10 13:58:26"
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            "field_branch_order" => "1"
            "field_url" => null
            "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1050
              #items: array:1 [
                0 => App\Models\Term {#1047
                  #connection: "mysql"
                  #table: "terms"
                  #primaryKey: "id"
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                    "created_at" => "2026-04-10 13:58:26"
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                    "name" => "Часть"
                    "field_cases" => array:6 [ …6]
                    "field_page_check_not_needed" => "1"
                    "field_short_name" => "ч."
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                    "id" => 31
                    "created_at" => "2026-04-10 13:58:26"
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                    "name" => "Часть"
                    "field_cases" => array:6 [ …6]
                    "field_page_check_not_needed" => "1"
                    "field_short_name" => "ч."
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            "book" => Illuminate\Database\Eloquent\Collection {#1082
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                0 => App\Models\Book {#1049
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                    "id" => 14
                    "created_at" => "2026-04-10 13:58:26"
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                    "field_subject" => Illuminate\Database\Eloquent\Collection {#1051
                      #items: array:1 [
                        0 => App\Models\Term {#1048
                          #connection: "mysql"
                          #table: "terms"
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                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Алгебра"
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                            "field_cases" => array:6 [ …6]
                            "field_foreign_lang_name" => null
                            "field_short_name" => null
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                            "field_translit" => "algebra"
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                            "id" => 6471
                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
                            "name" => "Алгебра"
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                            "field_cases" => array:6 [ …6]
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                            "field_short_name" => null
                            "field_subject_type" => "technical_subject"
                            "field_translit" => "algebra"
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                      #escapeWhenCastingToString: false
                    }
                    "field_class" => Illuminate\Database\Eloquent\Collection {#1052
                      #items: array:1 [
                        0 => App\Models\Term {#1053
                          #connection: "mysql"
                          #table: "terms"
                          #primaryKey: "id"
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                            "created_at" => "2026-04-10 13:58:26"
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                            "created_at" => "2026-04-10 13:58:26"
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                    "field_publisher" => Illuminate\Database\Eloquent\Collection {#1054
                      #items: array:1 [
                        0 => App\Models\Term {#1055
                          #connection: "mysql"
                          #table: "terms"
                          #primaryKey: "id"
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                            "created_at" => "2026-04-10 13:58:26"
                            "updated_at" => null
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                          #original: array:6 [
                            "id" => 5155
                            "created_at" => "2026-04-10 13:58:26"
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                    "field_author" => Illuminate\Database\Eloquent\Collection {#1056
                      #items: array:5 [
                        0 => App\Models\Term {#1057
                          #connection: "mysql"
                          #table: "terms"
                          #primaryKey: "id"
                          #keyType: "int"
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                        1 => App\Models\Term {#1058
                          #connection: "mysql"
                          #table: "terms"
                          #primaryKey: "id"
                          #keyType: "int"
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                          #connection: "mysql"
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                          #connection: "mysql"
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                    "field_description_bottom" => "<!--Текст в низу страницы--> <h2> Чем порадует учеников алгебра в 8 классе? </h2> <p> Школьники все надеются, что программа обучения станет немного более понятной и простой. Особенно это касается алгебры - предмета со всех сторон весьма непростого. Но в восьмом классе их надеждам тоже не суждено сбыться. Мало того, что материал предстоит учить весьма обширный, количество домашних заданий увеличится, так еще добавится подготовка к предстоящим вскоре ОГЭ. Чтобы справиться со всем этим, учащимся стоит воспользоваться «<strong>ГДЗ по Алгебре 8 класс Учебник Мордкович (Мнемозина, 2021 г.)</strong>». </p> <p> Школьникам в этом году предстоит изучать такие сложные темы как: <ol> <li>Действия с алгебраическими дробями.</li> <li>Преобразование рациональных уравнений.</li> <li>Теория вероятности.</li> <li>Модуль числа.</li> <li>Линейные и квадратные неравенства.</li> <li>Комбинаторность, и т.д.</li> </ol> <p> Больше всего трудностей возникает при построении графиков функций, которые перед этим нужно найти. Подобрать правильное уравнение весьма непросто, особенно если нет понимания, как именно это делается. Как показывает практика, многие ученики испытывают проблемы именно при решении неравенств. У подростков часто нет времени сидеть и детально изучать в чем именно прослеживается недочет. Этого можно сразу и не понять, если раньше были упущены какие-то навыки. Поэтому решебник станет отличным вариантом для устранения всех возникающих недопониманий. </p> <h2> Насколько полезен решебник к учебнику Мордковича? </h2> <p> Споры касательно применения электронных справочников ведутся уже давно. Но школьники обычно в них не участвуют, так как прекрасно понимают незаменимость и актуальность этих пособий. <strong>Готовые решения по алгебре за 8 класс к учебнику(задачнику) Мордковича А. Г.</strong> позволяют им полноценно освоить все аспекты учебного материала, восполнить пробелы и проработать проблемные моменты, не затрачивая на это много времени и сил. </p> <p> Конечно, достигнуть хороших результатов можно только при определенных условиях:</p> <ol> <li>никогда нельзя забывать про изучение теории, даже если ее в учебнике самый минимум;</li> <li>домашние задания всегда нужно выполнять самостоятельно, без подсказок;</li> <li>сверяя решения по сборнику, стоит помнить о внимательности;</li> <li>если найдены ошибки, их необходимо не только исправить, но и понять, почему они возникли.</li> </ol> <p> Только такой подход гарантирует успешное освоение дисциплины. Однако у учеников всегда присутствует соблазн просто списать ответы. Принесет ли им это пользу? Безусловно, пару-тройку хороших оценок они получат, но что дальше? Преподаватель рано или поздно заметит обман и придется нагонять программу, которая стремительно несется вперед. К тому же, доверие учителя уже будет потеряно, что может положить конец отличной успеваемости. Так что рисковать явно не стоит. </p> <h2> Решебник - уникальное учебное пособие </h2> <p> У каждого ребенка свои таланты. Одним хорошо даются точные науки, другим - гуманитарные. Но практически все школьники испытывают трудности при освоении алгебры. Лишь единицы подростков легко ориентируются в материале, формулах и уравнениях. Остальным же требуется дополнительная помощь. Оказать ее могут <strong>подробные решения по алгебре 8 класс Мордковича</strong>. </p> <p> В справочнике размещены все необходимые сведения, которые помогут усвоить изучаемый параграф: <ul> <li>верные ответы на все номера;</li> <li>доскональные решения;</li> <li>подробные наглядные примеры;</li> <li>дополнительные примечания.</li> </ul> <p> Сборник создан группой профессиональных методистов, которые максимально подробно описали все действия, что нужно совершить ученикам, чтобы получить правильные результаты. Периодически сверяясь с решебником восьмиклассники получают возможность удостовериться в своей правоте, либо проработать недочеты. </p>"
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                    "field_description_bottom" => "<!--Текст в низу страницы--> <h2> Чем порадует учеников алгебра в 8 классе? </h2> <p> Школьники все надеются, что программа обучения станет немного более понятной и простой. Особенно это касается алгебры - предмета со всех сторон весьма непростого. Но в восьмом классе их надеждам тоже не суждено сбыться. Мало того, что материал предстоит учить весьма обширный, количество домашних заданий увеличится, так еще добавится подготовка к предстоящим вскоре ОГЭ. Чтобы справиться со всем этим, учащимся стоит воспользоваться «<strong>ГДЗ по Алгебре 8 класс Учебник Мордкович (Мнемозина, 2021 г.)</strong>». </p> <p> Школьникам в этом году предстоит изучать такие сложные темы как: <ol> <li>Действия с алгебраическими дробями.</li> <li>Преобразование рациональных уравнений.</li> <li>Теория вероятности.</li> <li>Модуль числа.</li> <li>Линейные и квадратные неравенства.</li> <li>Комбинаторность, и т.д.</li> </ol> <p> Больше всего трудностей возникает при построении графиков функций, которые перед этим нужно найти. Подобрать правильное уравнение весьма непросто, особенно если нет понимания, как именно это делается. Как показывает практика, многие ученики испытывают проблемы именно при решении неравенств. У подростков часто нет времени сидеть и детально изучать в чем именно прослеживается недочет. Этого можно сразу и не понять, если раньше были упущены какие-то навыки. Поэтому решебник станет отличным вариантом для устранения всех возникающих недопониманий. </p> <h2> Насколько полезен решебник к учебнику Мордковича? </h2> <p> Споры касательно применения электронных справочников ведутся уже давно. Но школьники обычно в них не участвуют, так как прекрасно понимают незаменимость и актуальность этих пособий. <strong>Готовые решения по алгебре за 8 класс к учебнику(задачнику) Мордковича А. Г.</strong> позволяют им полноценно освоить все аспекты учебного материала, восполнить пробелы и проработать проблемные моменты, не затрачивая на это много времени и сил. </p> <p> Конечно, достигнуть хороших результатов можно только при определенных условиях:</p> <ol> <li>никогда нельзя забывать про изучение теории, даже если ее в учебнике самый минимум;</li> <li>домашние задания всегда нужно выполнять самостоятельно, без подсказок;</li> <li>сверяя решения по сборнику, стоит помнить о внимательности;</li> <li>если найдены ошибки, их необходимо не только исправить, но и понять, почему они возникли.</li> </ol> <p> Только такой подход гарантирует успешное освоение дисциплины. Однако у учеников всегда присутствует соблазн просто списать ответы. Принесет ли им это пользу? Безусловно, пару-тройку хороших оценок они получат, но что дальше? Преподаватель рано или поздно заметит обман и придется нагонять программу, которая стремительно несется вперед. К тому же, доверие учителя уже будет потеряно, что может положить конец отличной успеваемости. Так что рисковать явно не стоит. </p> <h2> Решебник - уникальное учебное пособие </h2> <p> У каждого ребенка свои таланты. Одним хорошо даются точные науки, другим - гуманитарные. Но практически все школьники испытывают трудности при освоении алгебры. Лишь единицы подростков легко ориентируются в материале, формулах и уравнениях. Остальным же требуется дополнительная помощь. Оказать ее могут <strong>подробные решения по алгебре 8 класс Мордковича</strong>. </p> <p> В справочнике размещены все необходимые сведения, которые помогут усвоить изучаемый параграф: <ul> <li>верные ответы на все номера;</li> <li>доскональные решения;</li> <li>подробные наглядные примеры;</li> <li>дополнительные примечания.</li> </ul> <p> Сборник создан группой профессиональных методистов, которые максимально подробно описали все действия, что нужно совершить ученикам, чтобы получить правильные результаты. Периодически сверяясь с решебником восьмиклассники получают возможность удостовериться в своей правоте, либо проработать недочеты. </p>"
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                    "field_publisher" => Illuminate\Database\Eloquent\Collection {#1172 …2}
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            "text" => "<p>квадратного уравнения.</p><p><strong>5. Преобразуйте уравнение</strong> $1.2x^2 + 0.4x - 5 = 0$ к уравнению с целыми коэффициентами.</p>"
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            "text" => "<p>квадратного уравнения.</p><p><strong>5. Преобразуйте уравнение</strong> $1.2x^2 + 0.4x - 5 = 0$ к уравнению с целыми коэффициентами.</p>"
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            "text" => "<p>Для того чтобы преобразовать уравнение $1,2x^2 + 0,4x - 5 = 0$ в уравнение с целыми коэффициентами, необходимо избавиться от десятичных дробей. Этого можно достичь, умножив обе части уравнения на подходящее число.</p><p>Сначала представим коэффициенты с десятичными дробями в виде обыкновенных дробей:</p><p>$1,2 = \frac{12}{10} = \frac{6}{5}$</p><p>$0,4 = \frac{4}{10} = \frac{2}{5}$</p><p>Теперь подставим эти значения обратно в уравнение:</p><p>$\frac{6}{5}x^2 + \frac{2}{5}x - 5 = 0$</p><p>Чтобы избавиться от знаменателей, нужно умножить обе части уравнения на наименьшее общее кратное знаменателей. В данном случае знаменатель у обоих дробных коэффициентов равен 5, поэтому умножим все уравнение на 5:</p><p>$5 \cdot \left(\frac{6}{5}x^2 + \frac{2}{5}x - 5\right) = 5 \cdot 0$</p><p>Применим распределительный закон умножения:</p><p>$(5 \cdot \frac{6}{5})x^2 + (5 \cdot \frac{2}{5})x - (5 \cdot 5) = 0$</p><p>$6x^2 + 2x - 25 = 0$</p><p>В полученном уравнении все коэффициенты (6, 2, -25) являются целыми числами. Таким образом, мы выполнили требуемое преобразование.</p><p>Ответ: $6x^2 + 2x - 25 = 0$</p>"
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            "text" => "<p>Для того чтобы преобразовать уравнение $1,2x^2 + 0,4x - 5 = 0$ в уравнение с целыми коэффициентами, необходимо избавиться от десятичных дробей. Этого можно достичь, умножив обе части уравнения на подходящее число.</p><p>Сначала представим коэффициенты с десятичными дробями в виде обыкновенных дробей:</p><p>$1,2 = \frac{12}{10} = \frac{6}{5}$</p><p>$0,4 = \frac{4}{10} = \frac{2}{5}$</p><p>Теперь подставим эти значения обратно в уравнение:</p><p>$\frac{6}{5}x^2 + \frac{2}{5}x - 5 = 0$</p><p>Чтобы избавиться от знаменателей, нужно умножить обе части уравнения на наименьшее общее кратное знаменателей. В данном случае знаменатель у обоих дробных коэффициентов равен 5, поэтому умножим все уравнение на 5:</p><p>$5 \cdot \left(\frac{6}{5}x^2 + \frac{2}{5}x - 5\right) = 5 \cdot 0$</p><p>Применим распределительный закон умножения:</p><p>$(5 \cdot \frac{6}{5})x^2 + (5 \cdot \frac{2}{5})x - (5 \cdot 5) = 0$</p><p>$6x^2 + 2x - 25 = 0$</p><p>В полученном уравнении все коэффициенты (6, 2, -25) являются целыми числами. Таким образом, мы выполнили требуемое преобразование.</p><p>Ответ: $6x^2 + 2x - 25 = 0$</p>"
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                    "field_branch_type" => Illuminate\Database\Eloquent\Collection {#1196 …2}
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№5 (с. 144)
Условие. №5 (с. 144)
скриншот условия
Алгебра, 8 класс Учебник, авторы: Мордкович Александр Григорьевич, Александрова Лилия Александровна, Мишустина Татьяна Николаевна, Тульчинская Елена Ефимовна, Семенов Павел Владимирович, издательство Мнемозина, Москва, 2019, Часть 1, страница 144, номер 5, Условие

квадратного уравнения.

5. Преобразуйте уравнение $1.2x^2 + 0.4x - 5 = 0$ к уравнению с целыми коэффициентами.

Решение 1. №5 (с. 144)
Алгебра, 8 класс Учебник, авторы: Мордкович Александр Григорьевич, Александрова Лилия Александровна, Мишустина Татьяна Николаевна, Тульчинская Елена Ефимовна, Семенов Павел Владимирович, издательство Мнемозина, Москва, 2019, Часть 1, страница 144, номер 5, Решение 1
Решение 6. №5 (с. 144)

Для того чтобы преобразовать уравнение $1,2x^2 + 0,4x - 5 = 0$ в уравнение с целыми коэффициентами, необходимо избавиться от десятичных дробей. Этого можно достичь, умножив обе части уравнения на подходящее число.

Сначала представим коэффициенты с десятичными дробями в виде обыкновенных дробей:

$1,2 = \frac{12}{10} = \frac{6}{5}$

$0,4 = \frac{4}{10} = \frac{2}{5}$

Теперь подставим эти значения обратно в уравнение:

$\frac{6}{5}x^2 + \frac{2}{5}x - 5 = 0$

Чтобы избавиться от знаменателей, нужно умножить обе части уравнения на наименьшее общее кратное знаменателей. В данном случае знаменатель у обоих дробных коэффициентов равен 5, поэтому умножим все уравнение на 5:

$5 \cdot \left(\frac{6}{5}x^2 + \frac{2}{5}x - 5\right) = 5 \cdot 0$

Применим распределительный закон умножения:

$(5 \cdot \frac{6}{5})x^2 + (5 \cdot \frac{2}{5})x - (5 \cdot 5) = 0$

$6x^2 + 2x - 25 = 0$

В полученном уравнении все коэффициенты (6, 2, -25) являются целыми числами. Таким образом, мы выполнили требуемое преобразование.

Ответ: $6x^2 + 2x - 25 = 0$

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