(x-y)^3乘(y-x)等于多少?A,(x-y)^4;B,(y-x)^4;C,-(x-y)^4;D,(x+y)^4
问题描述:
(x-y)^3乘(y-x)等于多少?A,(x-y)^4;B,(y-x)^4;C,-(x-y)^4;D,(x+y)^4
答
=-(x-y)^4
选C