问题 解答题

计算:(y-x)3•(x-y)n+2(x-y)n+1•(y-x)2

答案

原式=-(x-y)3•(x-y)n+2(x-y)n+1•(x-y)2

=-(x-y)3+n+2(x-y)n+3

=(x-y)n+3

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