2^m=3 4^n=8 ,则2的3m-2n+3次方=?
问题描述:
2^m=3 4^n=8 ,则2的3m-2n+3次方=?
答
2^m=3
4^n=8=2^2n
2^(3m-2n+3)
=(2^m)^3*(2^2n)^-1+2^3
=3^3*8^-1*8
=27*(1/8)*8
=27