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已知双曲线的焦距为2c,离心率为e,若点(-1,0)与点(1,0)到直线的距离之...
已知双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327796320/SYS201310251237333277963009_ST/0.png)
的焦距为2c,离心率为e,若点(-1,0)与点(1,0)到直线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327796320/SYS201310251237333277963009_ST/1.png)
的距离之和为S,且S
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327796320/SYS201310251237333277963009_ST/2.png)
,则离心率e的取值范围是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327796320/SYS201310251237333277963009_ST/3.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327796320/SYS201310251237333277963009_ST/4.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327796320/SYS201310251237333277963009_ST/5.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327796320/SYS201310251237333277963009_ST/6.png)
考点分析:
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如图,给定两个平面单位向量
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(其中x,y∈R),则满足x+y≥
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C.
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D.
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B.2
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