3(a-b)-2(a+b)= 4(x+y)+5(2x-y)= 2,4(c-3d)-1,3(2c-d)= -3/4(1/3m+n)-1/4(3m+n)= быстрей !

3(a-b)-2(a+b) = 3a-3b-(2a+2b) = 3a-3b-2a-2b=a-b
4(x+y)+5(2x-y) = 4x+4y+10x-5y = 14x-y
2,4(c-3d)-1,3(2c-d) = 2,4c-7,2d-2,6c+1,3d = -5,9d-0,2c
-3/4(1/3m+n)-1/4(3m+n) = -1/4m-3/4n-3/4m-1/4n = -m-n

1) 3a-3b-2a+2b=a-b
2)4x+4y+10x-5y=14x-y
3)2.4c-7.2d-2,6c+1.3d=0.2c-5.9d
4) -1/4m+3/4n-3/4m+1/4n=-1m+1n