已知a^m,a^n=3,求a^3n+2n的值

问题描述:

已知a^m,a^n=3,求a^3n+2n的值
a^m=2

a^m等于几?
a^3m+2n
=a^3m×a^2n
=(a^m)^3×(a^n)^2
=(a^m)^3×9
把a^m代入自己算一下