若3^1-xX27^2x-4/9^-x=81^6,求x的值
问题描述:
若3^1-xX27^2x-4/9^-x=81^6,求x的值
答
3^1-xX27^2x-4/9^-x=3^(1-x+6x-12+2x)=3^(7x-11)=3^24
7x-11=24
x=5