已知椭圆
,过点
的直线
交椭圆
于
两点.
(1)证明:
;
(2)已知两点
.记直线
的斜率为
,直线
的斜率为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb4402aeb853b22f20992156957ef0fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22915aaafa59730a5266039dc8859496.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/18de8d74f723ffb1ba7bd48c05a70855.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1f1af7cbd9f3fafe09e6d72df4f0550.png)
(2)已知两点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f0ca1ae83f3a416e49b2e7ced2e203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9399c9a2a31b0e3165aea2d6ccc4f7c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b06b75fb4e379ff3b99e68f40136cad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67351fe10fcfc3f9072eec4c60bfaaa5.png)
更新时间:2022-01-14 12:44:24
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解题方法
【推荐1】已知椭圆![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d72a07a4e5acfc140a3cea1f26b951.png)
的离心率为
,其左、右焦点分别为
,左、右顶点分别为
,上、下顶点分别为
,四边形
的面积为4.
(1)求椭圆
的方程;
(2)直线
与椭圆
交于
两点,
(其中
为坐标原点),求直线
被以线段
为直径的圆截得的弦长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d72a07a4e5acfc140a3cea1f26b951.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f82eb4ba631d0f50d848aa6e576b379.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.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/04d468be20b4d43f5de75416de20e8ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92e5d91f4f631c580c155eba8c92bda4.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fc5bd66dd6d5e09ff0893a938aed56e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c0b06dc01c30d13f64be2ac6a1d811e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/643ef7d761de0e794fc39937dc72ac6a.png)
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【推荐2】已知点
在椭圆C:
(
)上,且椭圆的离心率为
.
(1)求椭圆C的方程;
(2)若斜率为1的直线l与椭圆C交于A,B两点,点
,
是以
为底边的等腰三角形,求弦
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c77942bcca29cfda51e5debdedf2cca7.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/1174142f3bba761585b6bc2653009b36.png)
(1)求椭圆C的方程;
(2)若斜率为1的直线l与椭圆C交于A,B两点,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25fe125be0d5686f498f98b9dbbf33bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4dfec890cdfdda355e19463f3be813.png)
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【推荐1】已知,椭圆C过点
,两个焦点为
,
,E,F是椭圆C上的两个动点,如果直线AE的斜率与AF的斜率互为相反数,直线EF的斜率为
,直线l与椭圆C相切于点A,斜率为
.
求椭圆C的方程;
求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67155ef426970f1ea09b1f1bdda3e1b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f20a97714f1557df361857a9ddc30b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05fc49d7aa36586488acf96ccdd0bbd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f375dc5addedc5f9fbb72d566939c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/731f980ccb6f902d460d0ea2920bfe2c.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/5117784d5f7629ba7d20788328e6a1cd.png)
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【推荐2】已知椭圆C:
的长轴长为8,且经过点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eb902b95c0d3ee1a1071c9125ef3f50.png)
求椭圆的方程;
是否存在过点
的直线l交椭圆于点R、T,且满足
,若存在,求出直线l的方程;若不存在,说明理由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d125266f7bffeb5292742d81fd65432.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eb902b95c0d3ee1a1071c9125ef3f50.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/a3ced83acb8da92194aba3d49a154019.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b106a804d7c31a813e803a73c171d92.png)
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