问题
解答题
计算: (1)(-2012)0+(-3)2-(
(2)(x-2y)2-(x+2y)(x-2y) |
答案
(1)原式=1+9-4=6;
(2)原式=x2-4xy+4y2-(x2-4y2)=x2-4xy+4y2-x2+4y2=-4xy+8y2.
计算: (1)(-2012)0+(-3)2-(
(2)(x-2y)2-(x+2y)(x-2y) |
(1)原式=1+9-4=6;
(2)原式=x2-4xy+4y2-(x2-4y2)=x2-4xy+4y2-x2+4y2=-4xy+8y2.