已知9^m*27^m-1/3^2m的值为27,求m的值
问题描述:
已知9^m*27^m-1/3^2m的值为27,求m的值
答
9^m*27^m-1/3^2m
=3^2M*3^(3M+3)/3^2M
=3^(3M+3)=27=3^3
3M+3=3
M=0