log9(1/27)=
问题描述:
log9(1/27)=
答
log9(1/27)
=-log9(27)
=-(ln9)/(ln27) 换底为方便理解,我用了以e为底,都可以的比较用10
=-(ln3^2)/(ln3^3)
=-(2ln3)/(3ln3)
=-2/3