已知:椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102311062624439/SYS201311031023110626244013_ST/0.png)
的离心率
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102311062624439/SYS201311031023110626244013_ST/1.png)
,则实数k的值为
.
考点分析:
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