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Помогите пожалуйста срочно!!!!!! {х+у=7 {2x-y=-1 Смотреть ответ annanaz2006123 annanaz2006123 Ответ: у=5, х=2 Объяснение: выразим Х через У выразим Х через УИ подставим во второе уравнение {х=7-у, {2(7-у) - у= -1; {14-2у-у= -1, {х=7-у; {14-3у=-1, {х=7-у; {-3у= -15, {х=7-у; Подставим полученый У в другое уравнение {у=5, {х=7-5 {у=5 {х=2 Спасибо выручил! Можете отметить лучшим, если так считаете;) Новые вопросы в Алгебра При якому значенні a один з коренів рівняння 3x^2 - ax + 6 = 0 дорівнює 2 Разложите число на простые множители 780 5. За два футбольных и четыре волейбольных мяча заплатили 2000 грн. После того как футбольный мяч подешевел в два раза, а волейбольный подорожал на 10 … 0 грн., то за футбольный мяч и два волейбольных заплатили 1000 грн. Какой была первоначальная цена каждого мяча? Помогите пожалуйста Сколькими способами можно выбрать двух дежурных из 21 человека СРОЧНО ДАМ 15 БАЛЛОВ Предыдущий Следующий Вместе мы знаем больше Этот сайт использует cookies Политика Cookies . 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Answer 1

Конечно, давайте разберемся с вашими вопросами.

1. Решение системы уравнений:

   У вас есть система уравнений:

   1. х + у = 7
   2. 2x - y = -1

   Вы хотите найти значения переменных x и у. Давайте решим эту систему. Мы можем воспользоваться методом замены или методом сложения/вычитания уравнений.

   Сначала решим первое уравнение относительно x:

   x = 7 - у

   Теперь подставим это выражение во второе уравнение:

   2(7 - у) - у = -1

   Умножим 2 на каждый член внутри скобок:

   14 - 2у - у = -1

   Теперь сложим -2у и -у:

   14 - 3у = -1

   Теперь добавим -14 к обоим сторонам, чтобы избавиться от 14:

   -3у = -1 - 14

   -3у = -15

   Теперь разделим обе стороны на -3, чтобы найти значение у:

   у = -15 / -3 у = 5

   Теперь, когда у равно 5, мы можем найти значение x, подставив его обратно в первое уравнение:

   x = 7 - 5 x = 2

   Итак, решение системы уравнений:

   x = 2, у = 5

2. Для вашего вопроса о корнях уравнения 3x^2 - ax + 6 = 0, нужно знать больше информации, чтобы найти значение переменной a. Вам нужно предоставить дополнительные сведения или условия, чтобы решить это уравнение.

3. Для разложения числа 780 на простые множители, вы можете применить метод поиска простых множителей. Начнем с делителя 2:

   780 = 2 * 390

   Теперь разложим 390:

   390 = 2 * 195

   Далее:

   195 = 3 * 65

   И еще:

   65 = 5 * 13

   Таким образом, разложение числа 780 на простые множители:

   780 = 2 * 2 * 3 * 5 * 13

   Эти числа являются простыми множителями числа 780.