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如果一个椭圆的长轴长是短轴长的两倍,那么这个椭圆的离心率为 .
如果一个椭圆的长轴长是短轴长的两倍,那么这个椭圆的离心率为 .
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已知椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101901835819636/SYS201311031019018358196008_ST/0.png)
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有相同的焦点,则a的值为( )
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C.4
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已知双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101901835819636/SYS201311031019018358196007_ST/0.png)
的两条渐近线方程是
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101901835819636/SYS201311031019018358196007_ST/1.png)
,若顶点到渐近线的距离为1,则双曲线的离心率为( )
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101901835819636/SYS201311031019018358196007_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101901835819636/SYS201311031019018358196007_ST/4.png)
D.
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101901835819636/SYS201311031019018358196006_ST/images0.png)
如图所示的程序的输出结果为S=132,则判断框中应填( )
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