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
(log2x)]=log3[log1 2
(log3y)]=log5[log1 3
(log5z)]=0,则x、y、z的大小关系是( )1 5
A. z<x<y
B. x<y<z
C. y<z<x
D. z<y<x
答
∵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....