若(x-y)的m次方=3,(x-y)的n次方=5,求(x-y)的m+n次方.

题目

若(x-y)的m次方=3,(x-y)的n次方=5,求(x-y)的m+n次方.

答案

(x-y)的m+n次方.
=(x-y)^m×(x-y)^n
=3×5
=15