log9[log8(log7x)]=0求x

问题描述:

log9[log8(log7x)]=0求x
需具体过程,一步也不能落下

log9[log8(log7x)]=0
log8(log7x)=1
log7x=8
x=7^8log8(log7x)=1,怎么得来的?log9n=0n=9^0=1