题目内容
已知a,b∈R,下列四个条件中,使
>1成立的必要不充分条件是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824053232227404.png)
A.a>b-1 | B.a>b+1 |
C.|a|>|b| | D.lna>lnb |
C
由
>1⇒
-1>0⇒
>0⇒(a-b)b>0⇒a>b>0或a<b<0⇒|a|>|b|,但由|a|>|b|不能得到a>b>0或a<b<0,即得不到
>1,故|a|>|b|是使
>1成立的必要不充分条件.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824053232227404.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824053232227404.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824053232289465.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824053232227404.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824053232227404.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.a>b-1 | B.a>b+1 |
C.|a|>|b| | D.lna>lnb |