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设双曲线=1(0<a<b)的半焦距为c,直线l过(a,0)(0,b)两点,已知原...
设双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230919274359171/SYS201311012309192743591007_ST/0.png)
=1(0<a<b)的半焦距为c,直线l过(a,0)(0,b)两点,已知原点到直线l的距离为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230919274359171/SYS201311012309192743591007_ST/1.png)
,则双曲线的离心率为( )
A.2
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230919274359171/SYS201311012309192743591007_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230919274359171/SYS201311012309192743591007_ST/3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230919274359171/SYS201311012309192743591007_ST/4.png)
考点分析:
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D.
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椭圆mx
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230919274359171/SYS201311012309192743591005_ST/0.png)
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或1
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A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230919274359171/SYS201311012309192743591004_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230919274359171/SYS201311012309192743591004_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230919274359171/SYS201311012309192743591004_ST/2.png)
D.
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已知椭圆长半轴与短半轴之比是5:3,焦距是8,焦点在x轴上,则此椭圆的标准方程是( )
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230919274359171/SYS201311012309192743591003_ST/0.png)
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B.
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=1
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230919274359171/SYS201311012309192743591003_ST/4.png)
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D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230919274359171/SYS201311012309192743591003_ST/6.png)
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