1 . 已知椭圆
的左顶点,右焦点分别为
,右准线为
,
(1)若直线
上不存在点
,使
为等腰三角形,求椭圆离心率的取值范围;
(2)在(1)的条件下,当
取最大值时,
点坐标为
,设
是椭圆上的三点,且
,求:以线段
的中心为原点,过
两点的圆方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8348c89c6f13053325f4e1c62e29a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(1)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/754b21397a7447766e490199d3afd6a8.png)
(2)在(1)的条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168b3e4b1d6f04226fa2687a72a268b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccc8350b12974ffc8d06fce36d158f02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6304c71fc3fb80bbfae48218893e2bea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9016e172f844dd03ca59c2778e9cd7c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8348c89c6f13053325f4e1c62e29a.png)
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2018-04-20更新
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2卷引用:【全国校级联考】江苏省姜堰、溧阳、前黄中学2018届高三4月联考数学试题