问题
解答题
计算
(1)-3x3y•2x2y2
(2)(-2a3b2)3
(3)(2x+y-3)(2x-y+3)
(4)(a3b4)2÷(ab2)3.
答案
(1)原式=-6x5y3;
(2)原式=-8a9b6;
(3)原式=(2x)2-(y-3)2=4x2-y2+6y-9;
(4)原式=a6b8÷a3b6=a3b2.
计算
(1)-3x3y•2x2y2
(2)(-2a3b2)3
(3)(2x+y-3)(2x-y+3)
(4)(a3b4)2÷(ab2)3.
(1)原式=-6x5y3;
(2)原式=-8a9b6;
(3)原式=(2x)2-(y-3)2=4x2-y2+6y-9;
(4)原式=a6b8÷a3b6=a3b2.