1 . 已知直线
与双曲线
交于
两点,且线段
的中点
的横坐标为
,则该双曲线的离心率为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab466aedd6e176088d8dee7bc3e3aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ec7fa23be9cbe9a50607ea6bc8a4ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
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2014高三·全国·专题练习
2 . 已知双曲线方程是x2-
=1,过定点P(2,1)作直线交双曲线于P1、P2两点,并使P(2,1)为P1P2的中点,则此直线方程是____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f021b9e13def0f22cb6779d43345440.png)
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