若(x-y)的m次方=3,(x-y)的n次方=5,求(x-y)的m+n次方.
问题描述:
若(x-y)的m次方=3,(x-y)的n次方=5,求(x-y)的m+n次方.
答
(x-y)的m+n次方.
=(x-y)^m×(x-y)^n
=3×5
=15