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.
计算:(y-x)3•(x-y)n+2(x-y)n+1•(y-x)2.
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.