Question

номер 632 алгебра 7 класс​

Answer 1

Ответ:

Объяснение:

1) 3(-2x + 1) - 2(x + 13) = 7x - 4(1 - x)

-6x + 3 - 2x - 26 = 7x - 4 + 4x

-6x - 2x - 7x - 4x = 26 - 3 - 4

-19x = 19

x = -1

2) -4(5 - 2a) + 3(a - 4) = 6(2 - a) - 5a

-20 + 8a + 3a - 12 = 12 - 6a - 5a

8a + 3a + 6a + 5a = 12 + 20 + 12

22a = 44

a = 2

3) 3y(4y - 1) - 2y(6y - 5) = 9y - 8(3 + y)

12y² - 3y - 12y² + 10y = 9y - 24 - 8y

- 3y + 10y - 9y + 8y = -24

6y = -24

y= -4

4) 15x + 6x(2 - 3x) = 9x(5 - 2x) - 36

15x + 12x - 18x² = 45x - 18x² - 36

15x + 12x - 18x² - 45x + 18x² = - 36

-18x = -36

x = 2