Выражения: 5)-4(x-y)+2(x+3y) 6)2(a-b)-4(b-a) 7)3,2(c+d)+5,8(c-d) 8)2/9(1,8m-5,4)-3/7(2,1m-4,2) , буду

5)-4(x-y)+2(x+3y)=-4х+4у+2х+6у=-2х+10у

6)2(a-b)-4(b-a)=2а-2b-4b+4a=6a-6b

7)3,2(c+d)+5,8(c-d)=3,2c+3,2d+5,8c-5,8d=9c-2,6d

8)2/9(1,8m-5,4)-3/7(2,1m-4,2)=0,4m-1,2-0,9m+1,8=-0,5m+0,6

-4(x-y)+2(x+3y)=-4x+4y+2x+6y=-2x+10y
2(a-b)-4(b-a)=2a-2b-4b+4a=6a-6b
3.2(c+d)+5.8(c-d)=3.2c+3.2d+5.8c-5.8d=9c-2.6d
2/9(1.8m-5.4)-3/7(2.1m-4.2)=2/5m-6/5-9/10m+9/5=-0.5m+0.6