1) (3x+y) - (-x - 4y)
2) (x+6y) - (8x-7y)
3) (m + n) - (m - n)
4) (m + 3) - (6m + 5) - (m-1)
5) (x-y)+(x+y)-(2x+y)
6) (0.2x - 3) - (x-2) - (0.4x-1)

Ответ:

Пошаговое объяснение:

1) (3x+y) - (-x - 4y)=3х+у+х+4у=4х+5у

2) (x+6y) - (8x-7y)=х+6у-8х+7у=13у-7х

3) (m + n) - (m - n)=m+n-m+n=2n

4) (m + 3) - (6m + 5) - (m-1)=m+3-6m-5-m+1=-6m-1

5) (x-y)+(x+y)-(2x+y)=x-y+x+y-2x-y=-y

6) (0.2x - 3) - (x-2) - (0.4x-1)=0,2х-3-х+2-0,4х+1=-1,2х