题目内容
(x-y+z)2-(x+y-z)2
答案:
解析:
解析:
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解:(x-y+z)2-(x+y-z)2 =[(x-y+z)+(x+y-z)][(x-y+z)-(x+y-z)] =(x-y+z+x+y-z)(x-y+z-x-y+z) =2x·(2z-2y) =4xz-4xy |
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