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过双曲线=1的一个焦点F作一条渐近线的垂线,若垂足恰在线段OF(O为原点)的垂直...
过双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212121702393600/SYS201310232121217023936015_ST/0.png)
=1的一个焦点F作一条渐近线的垂线,若垂足恰在线段OF(O为原点)的垂直平分线上,则双曲线的离心率为
.
考点分析:
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A.
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-1
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