(x-y)的6次方×(y-x)的5次方×(x-y)的4次方.
推荐回答（1个）
解：(x-y)^6×(y-x)^5×(x-y)^4
=(y-x)^6×(y-x)^5×(y-x)^4
=(y-x)^(6+5+4)
=(y-x)^15
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