(x-y)^4·(x-y)-2(y-x)³·（y-x)²怎么算,
问题描述：
(x-y)^4·(x-y)-2(y-x)³·（y-x)²怎么算,
答
(x-y)^4·(x-y)-2(y-x)³·（y-x)²
=(x-y)^4·(x-y)+2(x-y)³·（x-y)²
=(x-y)^5+2(x-y)^5
=3(x-y)^5
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