题目内容
若log2[log
(log2x)]=log3[log
(log3y)]=log5[log
(log5z)]=0,则x、y、z的大小关系是( )
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 5 |
| A.z<x<y | B.x<y<z | C.y<z<x | D.z<y<x |
∵log2[log
(log2x)]=log3[log
(log3y)]=log5[log
(log5z)]=0,
∴log
(log2x) =log
(log3y)=log
(log5z)=1,
∴log2x=
,log3y=
,log5z=
,
∴x=
,y=
,z=
,
∴z<x<y.
故选A.
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 5 |
∴log
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 5 |
∴log2x=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 5 |
∴x=
| 2 |
| 3 | 3 |
| 5 | 5 |
∴z<x<y.
故选A.
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