3^1-x×27^2x-4/9^-x=81^6,x=

问题描述:

3^1-x×27^2x-4/9^-x=81^6,x=

3^(1-x)×3^(6x-12)÷3^(-2x)=3^24
3^[(1-x)+(6x-12)-(-2x)]=3^24
3^(7x-11)=3^24
7x-11=24
x=5