题目内容
(x+y)2(x-y)2-(x-y)(x+y)(x2+y2)
答案:
解析:
解析:
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解:(x+y)2(x-y)2(x-y)(x+y)(x2+y2) =[(x+y)(x-y)]2-(x2-y2)(x2+y2) =(x2-y2)2-(x4-y4) =(x2-y2)(x2-y2)-(x4-y4) =x4-x2y2-x2y2+y4-x4+y4 =2y4-2x2y2 |
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