问题
解答题
(1)-3x2y2•(-2xy)2.
(2)(a-2b)2+(a+2b)(a-2b)
答案
(1)原式=-3x2y2•4x2y2=-12x4y4;
(2)原式=a2-4ab+4b2+a2-4b2=2a2-4ab.
(1)-3x2y2•(-2xy)2.
(2)(a-2b)2+(a+2b)(a-2b)
(1)原式=-3x2y2•4x2y2=-12x4y4;
(2)原式=a2-4ab+4b2+a2-4b2=2a2-4ab.