1) (c-d)-2d
2) 2x-(3y-2x)
3) 4(a-b)-2(b-a)
4) (n-3m)-(4n-6m)

Ответ:

1. (c - d) - 2d = c - d - 2d = c - 3d
2. 2x - (3y - 2x) = 2x - 3y + 2x = 4x - 3y
3. 4(a - b) - 2(b - a) = 4a - 4b - 2b + 2a = 6a - 6b
4. (n - 3m) - (4n - 6m) = n - 3m - 4n + 6m = n - 4n - 3m + 6m = -3n + 3m

Объяснение: