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Реши систему уравнений: {y+x=−7 x−y=19 Смотреть ответ vereschakodasha vereschakodasha Ответ:(6;-13) Объяснение:{y+x=-7             2x=12        y+6=-7                        -y+x=19             x=6            y=-13 Новые вопросы в Алгебра ДОПОМОЖІТЬ БУДЬ ЛАСКА ⬇️БУДУ ДУЖЕ ВДЯЧНИЙ ⬇️​ Решите уравнение x⁴+x³-8x²+3x+5=0 (150+150+х)/3=136 Знайти x ПОМОГИТЕ ПОЖАЛУЙСТА!!!! Дано рівняння ах=8. Укажіть усі значення а, при яких коренем даного рiвняння є від'ємне число.СРОЧНО!!!!!​ Предыдущий Следующий Вместе мы знаем больше Этот сайт использует cookies Политика Cookies . Вы можете указать условия хранения и доступ к cookies в своем браузере. 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Answer 1

Для решения уравнения системы:

1. {y + x = -7
2. x - y = 19

Мы можем использовать метод сложения/вычитания, чтобы избавиться от одной из переменных.

Сначала добавим оба уравнения:

(y + x) + (x - y) = -7 + 19

Теперь упростим:

2x = 12

Теперь найдем значение x, разделив обе стороны на 2:

x = 6

Теперь, когда у нас есть значение x, подставим его в одно из исходных уравнений, чтобы найти значение y:

y + 6 = -7

Вычтем 6 с обеих сторон:

y = -7 - 6

y = -13

Таким образом, решение системы уравнений:

x = 6 y = -13

Чтобы ответить на ваши следующие вопросы, давайте рассмотрим каждый из них:

1. Решите уравнение x⁴ + x³ - 8x² + 3x + 5 = 0: Для решения этого уравнения, вам придется использовать методы факторизации или численных методов, так как это уравнение высокой степени. Без дополнительной информации о методе, которым вы хотите решить это уравнение, я не могу предоставить точный ответ.

2. Найдите x, если (150 + 150 + x) / 3 = 136: Для решения этого уравнения, умножим обе стороны на 3, чтобы избавиться от деления:

150 + 150 + x = 136 * 3 300 + x = 408

Теперь, чтобы найти значение x, вычтем 300 с обеих сторон:

x = 408 - 300 x = 108

Ответ: x = 108

3. Дано уравнение ах = 8. Найдите все значения а, при которых корнем данного уравнения является отрицательное число: Для этого уравнения, чтобы иметь корень, равный отрицательному числу, необходимо, чтобы a и х были разных знаков.

Если а > 0, то х должно быть < 0. Если а < 0, то х должно быть > 0.

Таким образом, вам нужно найти все значения а, которые имеют противоположный знак к числу 8.

Ответ: a < 0 или a > 8.