名校
1 . 已知椭圆M的方程是
,直线
与椭圆M交于A、B两点,且椭圆M上存在点
满足
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/271e595c257e4c0ade90a9bbbf0e6b0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54479885d4ab2f717d2e97718da04b43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27fc47af52759972bdf52acc06959a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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2 . 已知
为圆
:
上的动点,过点
作
轴、
轴的垂线,垂足分别为
、
,连接
延长至点
,使得
,记点
的轨迹为曲线
.
(1)求曲线
的方程;
(2)直线
:
与圆
相切,直线
:
与曲线
相切,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f240cccaf24af8a796abb95cb42be52e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f34f2b1c4ad84bc68879c37afb59902.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15b256345d7109e081b7c895591e995d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95f8ef5ab6007dcbc90d01031eb42e2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6968ac2d8220cc3fcffe7b1577d7cecc.png)
您最近一年使用:0次
2019-11-10更新
|
704次组卷
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3卷引用:上海市进才中学2018-2019学年高二上学期期末数学试题
名校
3 . 已知椭圆
:
,若四点
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65b45e1f4131522eb9ed4b8e669144b0.png)
中恰有三点在椭圆
上.
(1)指出四点
中,可能不在椭圆
上的点,并说明理由;同时求出椭圆
的方程;
(2)过椭圆
的右焦点
的直线
与
交于
两点,点
的坐标为
.设
为坐标原点,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03834c2551c63813481c2e92d86baa44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65b45e1f4131522eb9ed4b8e669144b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f98584cf8471ee0643b7df1b60c432d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)指出四点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dded144c3bb0158bb4f3e651ccbc95ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)过椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/1166596d23c6204b1cc1949b72177dc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/450dcd0ba3560b44a4825cfc1043fadd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e57610afd116ab84660c807cc1aa3819.png)
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4 . 已知椭圆E的方程为
右焦点为
,直线
的倾斜角为
直线
与圆
相切于点Q,且点Q在
轴右侧,设直线
交椭圆E于两个不同点A、B.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/41cf9755-2f1a-48ae-aaf3-d5d68fd49c67.png?resizew=191)
(1)求直线
的方程;
(2)求△ABF的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/412e1cd1477909974e6db5a8841e6758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8727480c1bee756b95cece8f18527cac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49137970108f50350a3211aa0281faaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/41cf9755-2f1a-48ae-aaf3-d5d68fd49c67.png?resizew=191)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)求△ABF的面积.
您最近一年使用:0次
2019-11-09更新
|
1536次组卷
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3卷引用:上海市向明中学2018-2019学年高二下学期期中数学试题
上海市向明中学2018-2019学年高二下学期期中数学试题湖北省武汉市新洲区第三中学2020-2021学年高二上学期10月月考数学试题(已下线)重难点01:直线与椭圆的位置关系(分层练习)-2023-2024学年高二数学同步精品课堂(北师大版2019选择性必修第一册)
名校
5 . 已知抛物线
(
).
(1)若
上一点
到其焦点的距离为3,求
的方程;
(2)若
,斜率为2的直线
交
于A、B两点,交x轴的正半轴于点M,O为坐标原点,
,求点M的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b49cd0e83c4f9a3239084f138107ea1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fbdf49cd00af1ff87259836ddd9f6b.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b454cdb97c408300b50d945f002c2cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d5199549b47e180b07cb219ae40c9b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b454cdb97c408300b50d945f002c2cb.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7acff98078cdd32804d8f1c4efbe2ddd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b454cdb97c408300b50d945f002c2cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19468abe1aa4e99874d13b8359ec7332.png)
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2019-11-09更新
|
496次组卷
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5卷引用:上海市闵行区2019届高三第一学期(一模)期末质量监控数学试题
上海市闵行区2019届高三第一学期(一模)期末质量监控数学试题(已下线)2019年上海市闵行区高三上学期期末质量调研数学试题上海市东昌中学2019-2020学年高二上学期期末数学试题上海市吴淞中学2022-2023学年高二上学期期末数学试题上海市松江一中2022-2023学年高二下学期期中数学试题
名校
6 . 已知椭圆
:
,
,
分别是椭圆短轴的上下两个端点,
是椭圆的左焦点,P是椭圆上异于点
,
的点,若
的边长为4的等边三角形.
写出椭圆的标准方程;
当直线
的一个方向向量是
时,求以
为直径的圆的标准方程;
设点R满足:
,
,求证:
与
的面积之比为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b454cdb97c408300b50d945f002c2cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00df4f17848c072b51e80d427d486e31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5ed513f56811aa1d314514c5c10d90a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ef3c9dd64ecdf6d1fc3ab081aeb6a23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09a8ac969e5cec3be6abf4ff44c692e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5ed513f56811aa1d314514c5c10d90a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ef3c9dd64ecdf6d1fc3ab081aeb6a23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa117b0621fb0e843929b033a4c09814.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f670b461d9b13df3932d0b0eeaea1f22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b8c1bc582e15c8ae375017eff356fde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f670b461d9b13df3932d0b0eeaea1f22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4bb89a362c1faf4d0c306eabbb59710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/372ba3183665678900fbed833aabb3c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9763e9bc0e618b3a6338254410a058c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45e25e267418280b37e7d2f0bef11b2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e9be82ad7b51f39e8058452b0e87b67.png)
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2019-11-08更新
|
463次组卷
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6卷引用:2019年上海市崇明区高三上学期期末(一模)数学试题
2019年上海市崇明区高三上学期期末(一模)数学试题上海市华东师范大学第三附属中学2019-2020学年高二上学期12月月考数学试题2020届湖南省长沙市明达中学高三(高复部)第二次模拟考试理科数学试题(已下线)专题05 平面解析几何-2020年高三数学(理)3-4月模拟试题汇编(已下线)专题02圆锥曲线全章复习攻略--高二期末考点大串讲(沪教版2020选修一)(已下线)专题02 圆锥曲线--高二期末考点大串讲(沪教版2020选修)
7 . 教材曾有介绍:圆
上的点
处的切线方程为
我们将其结论推广:椭圆
的点
处的切线方程为
在解本题时可以直接应用,已知直线
与椭圆E:
有且只有一个公共点.
(1)求
的值;
(2)设O为坐标原点,过椭圆E上的两点A、B分别作该椭圆的两条切线
,且
与
交于点M![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf278d3ece654fea3fdf89e532c685a9.png)
①设
,直线AB、OM的斜率分别为
,求证:
为定值;
②设
,求△OAB面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3503d330608e7138d1b529aba4512fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27477c4eba717135b559c18fb786e36b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26f965cfee1311f0df39396b035770e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d891034f9d4ee622e083d44989b7fdc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27477c4eba717135b559c18fb786e36b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65adcbe574b14ad635df2c6f03f4822f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c93215f460bffca5bdae786eb42144b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a98f8484a21113a5e5b933ab1b0c9114.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)设O为坐标原点,过椭圆E上的两点A、B分别作该椭圆的两条切线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50297ad9f7256b4d2efc3462289f18b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf278d3ece654fea3fdf89e532c685a9.png)
①设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0baedc4d7e690ab3f7d80d30ba0a9efe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42623f14667ebfa914eb12d026023d6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4757181824e15e0f21e5bdd55448783.png)
②设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2725a89d93c791f7a0098f4964587905.png)
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8 . 已知椭圆
上两个不同的点
、
关于直线
对称.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/bc1655c6-c3fe-4726-bbf8-bbff59ba01f4.png?resizew=207)
(1)若已知
,
为椭圆上动点,证明:
;
(2)求实数
的取值范围;
(3)求
面积的最大值(
为坐标原点).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/271e595c257e4c0ade90a9bbbf0e6b0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0cad1e0d712019c6bd59460dfdaa94c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/bc1655c6-c3fe-4726-bbf8-bbff59ba01f4.png?resizew=207)
(1)若已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdecdbcf310eecf9a369b549703981b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ba81f1a74bab4766faf309e35039ad1.png)
(2)求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd2981bf2261343f905ec1b5355a3c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
您最近一年使用:0次
2019-11-07更新
|
869次组卷
|
3卷引用:上海市南洋模范中学2019-2020学年高三上学期9月月考数学试题
名校
9 . 给定椭圆
,称圆心在坐标原点
,半径为
的圆是椭圆
的“伴椭圆”,若椭圆
右焦点坐标为
,且过点
.
(1)求椭圆
的“伴椭圆”方程;
(2)在椭圆
的“伴椭圆”上取一点
,过该点作椭圆的两条切线
、
,证明:两线垂直;
(3)在双曲线
上找一点
作椭圆
的两条切线,分别交于切点
、
使得
,求满足条件的所有点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da001dad7941e6c9858637d7b62cec59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b707fdf035eb2fb4467958893c60381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a904c923ca5efc55a8a158e74ae4b0b.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)在椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0210da9839dce53ae6f0533764d24ea3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
(3)在双曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a218602e8e3a52f74f760059aa7014.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.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/f1b136c779c2f9b8ee572b459746b5f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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名校
10 . 已知椭圆
的焦点和上顶点分别为
我们称
为椭圆C的“特征三角形”,如果两个椭圆的特征三角形是相似三角形,那么称这两个椭圆为“相似椭圆”,且特征三角形的相似比即为相似椭圆的相似比,已知椭圆
的一个焦点为
且椭圆上的任意一点到两焦点的距离之和为4.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/16852837-b77a-47b6-b112-3715969a8dee.png?resizew=160)
(1)若椭圆
与椭圆
相似,且相似比为2,求椭圆
的方程;
(2)如图,直线
与两个“相似椭圆”
和
分别交于点A、B和点C、D,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95b226cf7231f4612656f11a2c51a300.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4d359da6dc81ee275c271e23e3cff2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3824d9d42a2bd926fbd8f99a2c37eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99cd361ce118bca96a731b241a9c587d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/015fd3d7ef6a2bdd35559448b4291394.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/16852837-b77a-47b6-b112-3715969a8dee.png?resizew=160)
(1)若椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
(2)如图,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ceb69ac6dff5d3ee033172ac3f82c246.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e260568f9780193ef27fb84e3efa39.png)
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