已知3^m=5,3^n=2,求3^(2m-3n+1)的值

问题描述:

已知3^m=5,3^n=2,求3^(2m-3n+1)的值

3^(2m-3n+1)
=(3^2m)/(3^3n)×3
=(3^m)^2/(3^n)^3×3
=(5^2)/(2^3)×3
=75/8