Раскрыть скобки:
1. (a-b+c)-(a-b)=
3-(x-y+3)=
a-(a-b+c)=
(x-y)-(x+y)=
(x-y)-(y-x)=
2. (m-p+q)-p=
(a-b+1)-(a+b-1)=
m-(m-p+q)=
(m-p+5)-(m+p-3)=
m-(p-m)=

1. a-b+c-a+b = c3-x+y-3 = -x+y = y-xa-a+b-c = b-cx-y-x-y = -2yx-y+y+x = 2x2. m-p+q-p = m-2p+qa-b+1-a-b+1 = -2b+2m-m+p-q = p-qm-p+5-m-p+3 = -2p+8m-p+m = 2m - p