已知点
,点
、
分别为双曲线
的左、右顶点.若
为正三角形,则该双曲线的离心率为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23a84757fa1fc2e9bf6134c12dce7fe0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f46cd1e6396dc387579df7dedab400d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
更新时间:2020-01-10 15:10:11
|
【知识点】 求双曲线的离心率或离心率的取值范围
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(0.85)
解题方法
【推荐1】已知双曲线
:
的左、右焦点分别为
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,
为坐标原点,以
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在第二象限内相交于点,与
的渐近线在第一象限内相交于点
,且
,则
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的面积为4,则
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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填空题-单空题
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(0.85)
名校
解题方法
【推荐2】已知双曲线
的左顶点为M,任意一条平行于x轴的直线交双曲线C于A,B两点,若总有
,则双曲线C的离心率为_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83bf4fd84818abac17a9d21237ac5ce5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0237a44ba310a6ab283810dd8c53b648.png)
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