1.1)-(a-b)=-a+b
2)-3(c-d)=-3c+3d
3)2(-x+y)=-2x+2y
4)x(-x+2y+1)=-x2+2xy+x
5)-y(x-y+3)=-xy+y2-3y
6)-2a(-a+b-4)=2a2-2ab+8a
7)-4(a-2b+3c-0,5)=-4a+8b-12c+2
8)c(-3a+2c-d+1)=-3ac+2c2-cd+c
9)-5x(x-0,2y+0,6n-1,8)=-5x2+xy-3n+9
2.1)17x-(3y+z)+(5z-x)-(2x-8y)=17x-3y-z+5z-x-2x+8y=14x+5y+4z
2)2(8x-5)+4(3x-7)-3(9x-11)=16x-10+12x-28-27x+33=x-5
3)1,9c+0,4b-(1,2a-2,6b)-(0,8a-1,1c)=1,9c+0,4b-1,2a+2,6b-0,8a+1,1c =3c+3b-2a
4)3,7a+2(1,3a-0,7b)-4(-0,1b+1,7a)=3,7a+2,6a-1,4b+0,4b-6,8a=-0,5a-1