题目内容
设x=log2
,y=2
,z=
-
,则x,y,z间的大小关系为( )
| 1 |
| 4 |
| 1 |
| 2 |
| 7 |
| 2 |
| A.y<z<x | B.z<x<y | C.x<y<z | D.x<z<y |
x=log2
=-2,y=2
=
,z=
-
>0,
∵
-(
-
)=2
-
=
-
>0
∴y>z>x
故选D.
| 1 |
| 4 |
| 1 |
| 2 |
| 2 |
| 7 |
| 2 |
∵
| 2 |
| 7 |
| 2 |
| 2 |
| 7 |
| 8 |
| 7 |
∴y>z>x
故选D.
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