若log2[log12(log2x)]=log3[log13(log3y)]=log5[log15(log5z)]=0,则x、y、z的大小关系是(  ) A.z

问题描述:

若log2[log

1
2
(log2x)]=log3[log
1
3
(log3y)]=log5[log
1
5
(log5z)]=0,则x、y、z的大小关系是(  )
A. z<x<y
B. x<y<z
C. y<z<x
D. z<y<x

∵log2[log12(log2x)]=log3[log13(log3y)]=log5[log15(log5z)]=0,∴log12(log2x) =log13(log3y)=log15(log5z)=1,∴log2x=12,log3y=13,log5z=15,∴x=2,y=33,z=55,∴z<x<y.故选A....