问题 填空题

用幂的形式表示结果:(x-y)2(y-x)3(x-y)4=______.

答案

(x-y)2(y-x)3(x-y)4

=-(x-y)2(x-y)3(x-y)4

=-(x-y)9

故答案为:-(x-y)9

单项选择题
单项选择题