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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/20131023212147954832982/SYS201310232121479548329009_ST/0.png)
(a>b>0)与双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212147954832982/SYS201310232121479548329009_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/20131023212147954832982/SYS201310232121479548329009_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212147954832982/SYS201310232121479548329009_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212147954832982/SYS201310232121479548329009_ST/4.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212147954832982/SYS201310232121479548329009_ST/5.png)
考点分析:
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212147954832982/SYS201310232121479548329004_ST/6.png)
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212147954832982/SYS201310232121479548329004_ST/7.png)
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