如图,已知椭圆
的两个焦点分别为
,且椭圆与直线
相切.
![](https://img.xkw.com/dksih/QBM/2023/4/6/3210683898822656/3210755080314880/STEM/349379d3c20948648a488141470f73b3.png?resizew=247)
(1)求椭圆的方程.
(2)设椭圆的左右顶点分别为
,若直线
与x轴交于T点,点M为直线l上异于点T的任意一点,直线
分别与椭圆交于P,Q两点,连结
的直线l与交于N点.是否存在t,使得直线
与以
为直径的圆总相切?若存在,求出t;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/871868260c78a20767eae39bcdb97476.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2da9340b67e9fc5762b55017fde9826d.png)
![](https://img.xkw.com/dksih/QBM/2023/4/6/3210683898822656/3210755080314880/STEM/349379d3c20948648a488141470f73b3.png?resizew=247)
(1)求椭圆的方程.
(2)设椭圆的左右顶点分别为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00442d96d695db2c58bf1fb7165fca94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce400ad2c8eeddd3a78251476aff7ac5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08c40c78e929946729c8ccd4cadf5740.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f46b053f98b1d05a2043e94eeaefea87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
17-18高三·北京·强基计划 查看更多[1]
更新时间:2023-04-06 17:20:50
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解答题-问答题
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【推荐1】已知椭圆
的左、右焦点分别为
和
,过焦点
且垂直于
轴的直线与椭圆
相交所得的弦长为
,椭圆
的离心率为
.
(1)求椭圆
的标准方程;
(2)点
是椭圆
上位于
轴上方的动点,若直线
和
与直线
分别交于
和
两点,设直线
和
的斜率分别为
和
,若线段
的长度小于
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851a5d6ec23256f9b4a9e98aa92945fe.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/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da01a3abe1c9dc4e6283afa0dc1a0d39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83e02c09428538ce8ae136cff26d3f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9355031ea0b2dc9cef3777621bc6d38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da01a3abe1c9dc4e6283afa0dc1a0d39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83e02c09428538ce8ae136cff26d3f2.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/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84e4123975f257306440158659634c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b881044b5c73db6fcce110525741b02.png)
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【推荐2】在平面直角坐标系xOy中,已知中心在坐标原点,焦点在坐标轴上的椭圆C的右焦点为
,且离心率
,过点
且斜率为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
的直线l交椭圆C于点A,B两点,D为AB的中点,过
作直线l的垂线
,直线OD与直线m相交于点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8b201c0b1a56b34d73edd645222957a.png)
![](https://img.xkw.com/dksih/QBM/2022/3/1/2926904546508800/2930372840038400/STEM/32e27874-cc25-4a0e-a49e-8ac6d28d6d80.png?resizew=189)
(1)求椭圆C的标准方程;
(2)证明:点P在一条定直线上;
(3)当
最大时,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6d6f746c2355072d914591bf60c3801.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c7316976a221c051a2c14df80b1347.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78751dd92549c57ecf1a9b656d3b5906.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8b201c0b1a56b34d73edd645222957a.png)
![](https://img.xkw.com/dksih/QBM/2022/3/1/2926904546508800/2930372840038400/STEM/32e27874-cc25-4a0e-a49e-8ac6d28d6d80.png?resizew=189)
(1)求椭圆C的标准方程;
(2)证明:点P在一条定直线上;
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3ed9b07603f37e35dd05d2897d9c2db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af2cc5f8cec8c498aa12c99c04e1c97d.png)
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【推荐1】如图,点A,B是椭圆
与曲线
的两个交点,其中点A与C关于原点对称,过点A作曲线
的切线与x轴交于点D.记△ABC与△ABD的面积分别是
,
.
![](https://img.xkw.com/dksih/QBM/2022/1/29/2905054090395648/2917103687188480/STEM/673722d0ecd643dfb31f792dae53ecb8.png?resizew=275)
(1)证明:
;
(2)若
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f66d2db4890d0b19edc1da08631a4aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bcd8ee2d8367c167d6ae0abc741b6b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://img.xkw.com/dksih/QBM/2022/1/29/2905054090395648/2917103687188480/STEM/673722d0ecd643dfb31f792dae53ecb8.png?resizew=275)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b9a5289a9bac56cc3befbf14419b205.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca27cc54ca0332245f5167488daa3408.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a38c43d922840f5f7693007beeb62b34.png)
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解题方法
【推荐2】已知椭圆
的右焦点为
,点
在椭圆上.
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572470766108672/1572470771818496/STEM/ceda92aa65fa4f249e1c241c2a05df10.png?resizew=229)
(1)求椭圆的方程;
(2)点
在圆
上,且
在第一象限,过
作圆
的切线交椭圆于
两点,求证:
的周长是定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6d6f746c2355072d914591bf60c3801.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/327126f348c456f0c628a2f57648ecea.png)
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572470766108672/1572470771818496/STEM/ceda92aa65fa4f249e1c241c2a05df10.png?resizew=229)
(1)求椭圆的方程;
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef74c4299221a967507c6a179337581a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef74c4299221a967507c6a179337581a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50667ce76318b23b69ac6b8e16dc80d0.png)
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