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Решить систему уравнений методом подстановки. {8y-x=7 2x-21y=2 Смотреть ответ Участник Знаний Участник Знаний Ответ: {8y-x=7 {2x-21y=2 {х=-7+8у {2х-21у=2 2(-7+8у)-21у=2 у=- 16/5 х=-7+8×(- 16/5) х=- 163/5 (х,у)=(- 163/5,- 16/5) {8×(- 16/5)-(- 163/5)=7 {2×(- 163/5)-21×(- 16/5)=2 {7=7 {2=2 (х,у)=(- 163/5, - 16/5) Новые вопросы в Алгебра Розкладіть на множники: 1) 18 t4 – 27 t3x5 Будь ласка допоможіть.^ ^ допоиожіть будьласка !!!!!!!!!!!!!!!! 4% -1,83 Найти 100% С объяснением! (-0,9)^2*(-5/9):(1,53:1,5-1 1/5).Найдите число A. Прошу,побыстрее,и с объяснением! Благодарю! Известно,что 4 % числа A равны значению выражения: (-0,9)^2*(-5/9):(1,53:1,6-1 1/5).Найдите число A. Прошу,побыстрее,и с объяснением! Благодарю! 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

Решение системы уравнений методом подстановки

Дано система уравнений:

1. 8y - x = 7 2. 2x - 21y = 2

Для решения системы уравнений методом подстановки, мы сначала выразим одну переменную через другую в одном из уравнений, а затем подставим это выражение во второе уравнение.

1. Решим первое уравнение относительно x: 8y - x = 7 x = 8y - 7

2. Подставим выражение для x во второе уравнение: 2(8y - 7) - 21y = 2 16y - 14 - 21y = 2 -5y = 16

3. Решим полученное уравнение для y: -5y = 16 y = -16/5

4. Теперь найдем значение x, подставив найденное значение y в первое уравнение: x = 8y - 7 x = 8*(-16/5) - 7 x = -163/5

Таким образом, решение системы уравнений методом подстановки равно (x, y) = (-163/5, -16/5).

Розкладіть на множники: 18t^4 – 27t^3x5

Для розкладу на множники даного виразу, спочатку визначимо найбільший спільний множник (НСМ) коефіцієнтів.

НСМ (18, 27) = 9

Тепер розкладемо кожен доданок даного виразу:

18t^4 = (9t^2)(2t^2) 27t^3x5 = (9t^2)(3tx5)

Таким чином, розклад виразу 18t^4 – 27t^3x5 на множники буде: 18t^4 – 27t^3x5 = (9t^2)(2t^2 – 3tx5)

Найти 100% при уменьшении на 1,83

Для нахождения значения 100% при уменьшении на 1,83, мы вычтем 1,83 из 100%:

100% - 1,83% = 98,17%

Таким образом, при уменьшении на 1,83, значение 100% составляет 98,17%.

Вычисление выражения (-0,9)^2*(-5/9):(1,53:1,5-1+1/5)

Для вычисления данного выражения, следуем порядку операций:

(-0,9)^2 = 0,81 1,53:1,5 = 1,02 1,02 - 1 + 1/5 = 0,02

Теперь подставим полученные значения обратно в исходное выражение:

0,81*(-5/9):0,02 = -0,45*(-5/9) = 0,25

Таким образом, выражение (-0,9)^2*(-5/9):(1,53:1,5-1+1/5) равно 0,25.

Поиск числа A при известном значении выражения

Для нахождения числа A при известном значении выражения, мы подставим значение выражения вместо 4% числа A и решим полученное уравнение:

Выражение: (-0,9)^2*(-5/9):(1,53:1,6-1+1/5)

4% числа A = (-0,9)^2*(-5/9):(1,53:1,6-1+1/5)

Для решения уравнения, выполним вычисления:

(-0,9)^2 = 0,81 1,53:1,6 = 0,95625

Выражение: 0,81*(-5/9):0,95625

0,81*(-5/9):0,95625 = -0,45*(-5/9):0,95625 = 0,25

Таким образом, числу A соответствует значение 0,25.