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