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已知椭圆(a>b>0)与双曲线(m>0,n>0)有相同的焦点(-c,0)和(c,...
已知椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895435593/SYS201311031005498954355008_ST/0.png)
(a>b>0)与双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895435593/SYS201311031005498954355008_ST/1.png)
(m>0,n>0)有相同的焦点(-c,0)和(c,0),若c是a、m的等比中项,n
2是2m
2与c
2的等差中项,则椭圆的离心率是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895435593/SYS201311031005498954355008_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895435593/SYS201311031005498954355008_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895435593/SYS201311031005498954355008_ST/4.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895435593/SYS201311031005498954355008_ST/5.png)
考点分析:
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已知双曲线:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895435593/SYS201311031005498954355007_ST/0.png)
,则以A(1,1)为中点的双曲线的弦所在的直线方程为( )
A.3x-y-2=0
B.x-3y+2=0
C.3x+y-2=0
D.不存在
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如果点P在平面区域
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上,点Q在曲线x
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A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895435593/SYS201311031005498954355006_ST/1.png)
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B.
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D.
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A.以A,B为焦点,短轴长为
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100549895435593/SYS201311031005498954355003_ST/0.png)
(a>b>0)中心的弦,F(c,0)是椭圆的右焦点,则△ABF面积的最大值是( )
A.bc
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D.b
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