题目内容
计算:
(x+y)5÷(-x-y)3·(x-y)2.
答案:
解析:
解析:
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解:原式=(x+y)5÷[-(x+y)3]·(x-y)2 =-(x+y)2(x-y)2 =-[(x+y)(x-y)]2=-(x2-y2)2=-x4+2x2y2-y4 |
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