等于274^n=82^(2n)=8n=1.52^(3m-2n+3)=2^3m=(2^m)^3=3^3=27
解:2^m=34^n=2^2n=8那么：2^(3m-2n+3)=[2^m ×2^m ×2^m]÷2^2n ×2^3=27÷8 ×8=27
