log18 2=m,则log6 2用m表示为?
问题描述:
log18 2=m,则log6 2用m表示为?
答
因为
log18 2=log6 2/log6 18
=log6 2/log6 (36/2)
=log6 2/(log6 36-log6 2)
=log6 2/(2log6 6-log6 2)
=log6 2/(2-log6 2)
所以
m=log6 2/(2-log6 2)
m(2-log6 2)=log6 2
2m-mlog6 2=log6 2
mlog6 2+log6 2=2m
(m+1)log6 2=2m
log6 2=2m/(m+1)