问题 解答题
计算下列各题.
(1)3a2b(-4a2b+2ab2-ab);
(2)-5x-(x2y-xy2)-2x2(
1
2
xy+y2)
答案

(1)原式=-12a4b2+6a3b3-3a3b2

(2)原式=-5x3y+5x2y2-x3y-2x2y2

=-5x3y+3x2y2-x3y.

简答题
单项选择题