题目内容
计算:
(1)(-
)-2+(π-1)0+(-2)2013×(-
)2012
(2)(2x-y)2-(x-y)(y+x)
(1)(-
1 |
3 |
1 |
2 |
(2)(2x-y)2-(x-y)(y+x)
(1)原式=9+1+[(-2)×(-
)]2012×(-2)=9+1-2=8;
(2)原式=4x2-4xy+y2-x2+y2=3x2-4xy+2y2.
1 |
2 |
(2)原式=4x2-4xy+y2-x2+y2=3x2-4xy+2y2.
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