a^m=2,a^n=3,則a^m+2n=?

a^m=2,a^n=3,則a^m+2n=?


題目是a^(m+2n)吧,這樣的話
a^(m+2n)=a^m*(a^n)^2=18



m-n=2,m-2n=3求m,n


m-n=2
m=2+n
2+n-2n=3
n= -1
m=1



m-n=2,m-2n+3=3求m,n?


n=2,m=4