Question

помогите пж 1,2,3 нужны​

Answer 1

1)

$x - (x - (2x - 6)) = x - (x - 2x + 6) = \\ = x - x + 2x - 6 = 2x - 6$

2)

$7a - ((b - a) + 7b) = 7a - (b - a + 7b) = \\ = 7a - b + a - 7b = 8a - 8b$

3)

$2m - (3m - (5m - (m + 1))) = \\ = 2m - (3m - (5m -m - 1)) = \\ = 2m - (3m - 5m + m + 1) = \\ = 2m - 3m + 5m - m - 1 = \\ = 7m - 4m - 1 = 3m - 1$