1 . 已知椭圆
的左、右焦点分别为
,左、右顶点分别为
,若以
为圆心,1为半径的圆与以
为圆心,3为半径的圆相交于
两点,若椭圆
经过
两点,且直线
的斜率之积为
.
(1)求椭圆
的方程;
(2)点
是直线
上一动点,过点
作椭圆
的两条切线,切点分别为
.
①求证直线
恒过定点,并求出此定点;
②求
面积的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7e5578ca83f5bd5c285994061b9c015.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00442d96d695db2c58bf1fb7165fca94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/653f7fd4d2c4e3d83302b857012a0baa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78fd95f89dec2d373fa57f02acd739f.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/495bb3e5a3a9d35f5c9f0cf1f5d51876.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
①求证直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ed4c4e8edbd179f3fc38a6653f18c1.png)
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3卷引用:浙江省杭州市浙里特色联盟2023-2024学年高二下学期4月期中联考数学试题
名校
2 . 已知椭圆
过点
,A、B为左右顶点,且
.
(1)求椭圆C的方程;
(2)过点A作椭圆内的圆
的两条切线,交椭圆于C、D两点,若直线CD与圆O相切,求圆O的方程;
(3)过点P作(2)中圆O的两条切线,分别交椭圆于两点Q、R,求证:直线QR与圆O相切.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851a5d6ec23256f9b4a9e98aa92945fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b3c639884f0ea1fe96c254e452d9420.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
(1)求椭圆C的方程;
(2)过点A作椭圆内的圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7121bfdb53eb8307706e8c63c4569b1d.png)
(3)过点P作(2)中圆O的两条切线,分别交椭圆于两点Q、R,求证:直线QR与圆O相切.
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2022-09-29更新
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3卷引用:浙江省杭州市长河高级中学2021-2022学年高二下学期期中数学试题
名校
解题方法
3 . 已知椭圆
:
,设过点
的直线
交椭圆
于
,
两点,交直线
于点
,点
为直线
上不同于点A的任意一点.
,求
的取值范围;
(2)若
,记直线
,
,
的斜率分别为
,
,
,问是否存在
,
,
的某种排列
,
,
(其中
,使得
,
,
成等差数列或等比数列?若存在,写出结论,并加以证明;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40c1fb9f8b59508b1b58180c899d1787.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8748dc55e2f45bc37fc4d84d7310f79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c93d5f956a50f96f2b257a61bcd1db09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3c442579603164f3fc19458677d307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbf434334b09cc0fdd4e86e84e6ceb00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbf434334b09cc0fdd4e86e84e6ceb00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8cc03cd251a03b73ebae3ea1d6bca76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2eb8885dc1f43959efc27d89291c61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b84ad6ffc62173c68ff3ca5cf19f14b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c5cfbf857a2ac07cbdada127302a3a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8cc03cd251a03b73ebae3ea1d6bca76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2eb8885dc1f43959efc27d89291c61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b84ad6ffc62173c68ff3ca5cf19f14b9.png)
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4卷引用:浙江省宁波市余姚中学2022-2023学年高二下学期期中数学试题