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椭圆的一个顶点与两个焦点构成等边三角形,则椭圆的离心率是( ) A. B. C....
椭圆的一个顶点与两个焦点构成等边三角形,则椭圆的离心率是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224251021178948/SYS201311012242510211789012_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224251021178948/SYS201311012242510211789012_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224251021178948/SYS201311012242510211789012_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224251021178948/SYS201311012242510211789012_ST/3.png)
考点分析:
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“ab>0”是“方程ax
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等( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224251021178948/SYS201311012242510211789009_ST/1.png)
B.
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C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224251021178948/SYS201311012242510211789009_ST/3.png)
D.
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抛物线x
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如果直线l的方向向量是
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224251021178948/SYS201311012242510211789007_ST/0.png)
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,那么( )
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