1 . 已知椭圆
,过点
作关于
轴对称的两条直线
,且
与椭圆交于不同两点
与椭圆交于不同两点
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/028e917d-7af6-44b5-8e7a-146635c5adee.png?resizew=176)
(1)已知
经过椭圆的左焦点,求
的方程;
(2)证明:直线
与直线
交于点
;
(3)求线段
长的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b95b1d4dc5d74b34db0ce281c38039ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e79f49a85a44ca8c61341e913341f7c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44434b647ec546fe787e2164e0be6cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c11bcc7389ee99011b2d77ee0bb4018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/028e917d-7af6-44b5-8e7a-146635c5adee.png?resizew=176)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
(2)证明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e241c20dbb4f324b6491da9f75222c9a.png)
(3)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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2022-12-28更新
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3卷引用:上海市曹杨第二中学2021届高三下学期3月月考数学试题