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以椭圆短轴为直径的圆经过此椭圆的焦点,则椭圆的离心率是( ) A. B. C. ...
以椭圆短轴为直径的圆经过此椭圆的焦点,则椭圆的离心率是( )
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.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230919274359171/SYS201311012309192743591004_ST/3.png)
考点分析:
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B.
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C.
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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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已知圆(x-2)
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A.2x+y-5=0
B.x-2y=0
C.2x+y-3=0
D.x-2y+4=0
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圆x
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2=2的经过点P(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230919274359171/SYS201311012309192743591001_ST/0.png)
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)的切线方程是( )
A.x+y=2
B.x+y=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230919274359171/SYS201311012309192743591001_ST/2.png)
C.x=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230919274359171/SYS201311012309192743591001_ST/3.png)
或x+y=2
D.x=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230919274359171/SYS201311012309192743591001_ST/4.png)
或x+y=
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平面内有两个定点F
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A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230919274359171/SYS201311012309192743591000_ST/0.png)
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=1(x≤-4)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230919274359171/SYS201311012309192743591000_ST/2.png)
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=1(x≤-3)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230919274359171/SYS201311012309192743591000_ST/4.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230919274359171/SYS201311012309192743591000_ST/5.png)
=1(x>≥4)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230919274359171/SYS201311012309192743591000_ST/6.png)
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=1(x≥3)
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230919274228428/SYS201311012309192742284022_ST/0.png)
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)的值与3的大小,并说明理由.
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