1)а) -2xy2(2y-3x+x2)=-4ху3+6х2у2-2х3у2
б) 3xy(2x-3x2 +4xy)(-2y2) =-6ху3(2x-3x2 +4xy) = -12х2у3+18х3у3-24х2у3
2) 4(x2-3x+2)-2(2x2-5x+1) = 4х2-12х+8-4х2+10х2=6-2х при х=-3 6-2*(-3)=6+6=12
1)а) -2xy2(2y-3x+x2)=-4ху3+6х2у2-2х3у2
б) 3xy(2x-3x2 +4xy)(-2y2) =-6ху3(2x-3x2 +4xy) = -12х2у3+18х3у3-24х2у3
2) 4(x2-3x+2)-2(2x2-5x+1) = 4х2-12х+8-4х2+10х2=6-2х при х=-3 6-2*(-3)=6+6=12