log6/27=a log18/16=?6为底数27的对数是a求18为底数16的对数

问题描述:

log6/27=a log18/16=?
6为底数27的对数是a求18为底数16的对数

log6/27
=log2/9
=log2-log9
=log2-2log3
log18/16
=log9/8
=log9-log8
=2log3-log8

(12-4a)/(3+a)