在平面直角坐标系
中,椭圆E:
(
)的长轴长为4,左准线l的方程为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/e575d02c-657e-469a-9eb1-3fe51654a2e0.png?resizew=211)
(1)求椭圆的标准方程;
(2)直线
过椭圆E的左焦点
,且与椭圆E交于A,B两点.
①若
,求直线
的方程;
②过A作左准线l的垂线,垂足为
,点
,求证:
,B,G三点共线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a089c207e39a24d0d82aa853ac2bbb8c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/e575d02c-657e-469a-9eb1-3fe51654a2e0.png?resizew=211)
(1)求椭圆的标准方程;
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51d79cbc472097d8905c1f11cfc357b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
②过A作左准线l的垂线,垂足为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36d59d82cb961f72864994b5e8454107.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
更新时间:2020-02-18 09:30:10
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