解:3^/X-1/=5,X=?(需详细解题过程)

问题描述:

解:3^/X-1/=5,X=?(需详细解题过程)

3^/X-1/=5 lg3^|x-1|=lg5 |x-1|=lg5/lg3=lg2 x1=1+lg2=lg20 x2=1-lg2=lg5