(3y-1)(2y-3)+(6y-5)(y-4)=_,[ab(3-b)-2a(b-1/2b2)](-3a2b3)=_.
问题描述:
(3y-1)(2y-3)+(6y-5)(y-4)=______,[ab(3-b)-2a(b-
b2)](-3a2b3)=______. 1 2
答
①(3y-1)(2y-3)+(6y-5)(y-4),
=6y2-11y+3+6y2-29y+20,
=12y2-40y+23;
②[ab(3-b)-2a(b-
b2)](-3a2b3),1 2
=(3ab-ab2-2ab+ab2)(-3a2b3),
=(ab)(-3a2b3),
=-3a3b4.