Question

Пожалуйста весь 2 вариант)

Answer 1

2b(3a+b)-(a-b)^2
6ab+2b^2-a^2-2ab+b^2
4ab+3b^2-a^2

Answer 2

6(2-5x)=9-7(4х-3)

Answer 3

12-30х=9-28х+21

Answer 4

-30х+28х=9+21-12

Answer 5

-2х=19

Answer 6

х=-9