已知椭圆
与圆
:
有且仅有两个公共点,点
、
、
分别是椭圆
上的动点、左焦点、右焦点,三角形
面积的最大值是
.
(1)求椭圆
的方程;
(2)若点
在椭圆第一象限部分上运动,过点
作圆
的切线
,过点
作
的垂线
,求证:
,
交点
的纵坐标的绝对值为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6272593f00b7e1293855f2aa7941a46d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49137970108f50350a3211aa0281faaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd5a8e1bc9748e5519dcd9981b7eb251.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.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/acc290b44635265137fdf13146b6a6d9.png)
2019·江西吉安·一模 查看更多[2]
更新时间:2019-05-09 15:10:22
|
相似题推荐
解答题-证明题
|
较难
(0.4)
解题方法
【推荐1】如图,设椭圆
为
的左、右焦点,过点
的直线
与
交于
两点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/23/5d7fd5cc-36f0-4b0b-87df-8830a219ad2d.png?resizew=165)
(1)若椭圆
的离心率为
的周长为6,求椭圆
的方程;
(2)求证:
为定值;
(3)是否存在直线
,使得
为等腰直角三角形?若存在,求出
的离心率
的值,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8112c46f2e246b372fc7311715a5fe50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b94469fd19f40116e2dec334919d6586.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b94469fd19f40116e2dec334919d6586.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ebaa32f4f1f4f807ca9aeb7fb29951.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/23/5d7fd5cc-36f0-4b0b-87df-8830a219ad2d.png?resizew=165)
(1)若椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b94469fd19f40116e2dec334919d6586.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a36105647a5d07581f1480d762971bb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b94469fd19f40116e2dec334919d6586.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10a967c3d913eaadaf22e75fb9dabde1.png)
(3)是否存在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5eb2485f90dbfd0dfd6e7d179a856f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b94469fd19f40116e2dec334919d6586.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168b3e4b1d6f04226fa2687a72a268b4.png)
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真题
名校
【推荐2】如图,在平面直角坐标系xOy中,椭圆C:
的焦点为F1(–1、0),F2(1,0).过F2作x轴的垂线l,在x轴的上方,l与圆F2:
交于点A,与椭圆C交于点D.连结AF1并延长交圆F2于点B,连结BF2交椭圆C于点E,连结DF1.已知DF1=
.
(2)求点E的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c97280a86e918ec0341ada4f94debaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/533a7b702ada1dd80123e4041271d521.png)
(2)求点E的坐标.
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(0.4)
【推荐1】如图,
为椭圆
的左右焦点,
是椭圆的两个顶点,
,
,若点
在椭圆
上,则点
称为点
的一个“椭点”.直线
与椭圆交于
两点,
两点的“椭点”分别为
,已知以
为直径的圆经过坐标原点
.
![](https://img.xkw.com/dksih/QBM/2016/9/13/1573017246253056/1573017252626432/STEM/0d8a2be9682a449594e191d815c94a82.png)
(1)求椭圆
的标准方程;
(2)试探讨
的面积
是否为定值?若为定值,求出该定值;若不为定值,请说明理由.
![](https://img.xkw.com/dksih/QBM/2016/9/13/1573017246253056/1573017252626432/STEM/369e183ae5c04faea39a5302d8f4ab0e.png)
![](https://img.xkw.com/dksih/QBM/2016/9/13/1573017246253056/1573017252626432/STEM/106b48f7c178493ea3a8b3db10045401.png)
![](https://img.xkw.com/dksih/QBM/2016/9/13/1573017246253056/1573017252626432/STEM/fd2935a180c14c829c1b4caf65a55f34.png)
![](https://img.xkw.com/dksih/QBM/2016/9/13/1573017246253056/1573017252626432/STEM/7b5993bfc157449a981a19e00ddbc4b8.png)
![](https://img.xkw.com/dksih/QBM/2016/9/13/1573017246253056/1573017252626432/STEM/975d6383c9054c0893c920220f34de5f.png)
![](https://img.xkw.com/dksih/QBM/2016/9/13/1573017246253056/1573017252626432/STEM/8707cfb5839d4ad582414ece2534b14d.png)
![](https://img.xkw.com/dksih/QBM/2016/9/13/1573017246253056/1573017252626432/STEM/fd597065ce624464a578a0a0f710ae6a.png)
![](https://img.xkw.com/dksih/QBM/2016/9/13/1573017246253056/1573017252626432/STEM/c3c040ca89b34200b3ae012a0cc13e39.png)
![](https://img.xkw.com/dksih/QBM/2016/9/13/1573017246253056/1573017252626432/STEM/aebb8e1d6a804394a667dc7aaf12c4fa.png)
![](https://img.xkw.com/dksih/QBM/2016/9/13/1573017246253056/1573017252626432/STEM/266b3948cb56462c9df0809b258e5550.png)
![](https://img.xkw.com/dksih/QBM/2016/9/13/1573017246253056/1573017252626432/STEM/84e8c612e162479fb9fccca6e131ed83.png)
![](https://img.xkw.com/dksih/QBM/2016/9/13/1573017246253056/1573017252626432/STEM/84e8c612e162479fb9fccca6e131ed83.png)
![](https://img.xkw.com/dksih/QBM/2016/9/13/1573017246253056/1573017252626432/STEM/a2e2efeae0b540d486fb0863c99ba828.png)
![](https://img.xkw.com/dksih/QBM/2016/9/13/1573017246253056/1573017252626432/STEM/79d921a9a1e845c5ba6d13a2b0a40697.png)
![](https://img.xkw.com/dksih/QBM/2016/9/13/1573017246253056/1573017252626432/STEM/5148ebdd689d441f89d5bf0c4f3c6e84.png)
![](https://img.xkw.com/dksih/QBM/2016/9/13/1573017246253056/1573017252626432/STEM/0d8a2be9682a449594e191d815c94a82.png)
(1)求椭圆
![](https://img.xkw.com/dksih/QBM/2016/9/13/1573017246253056/1573017252626432/STEM/fd597065ce624464a578a0a0f710ae6a.png)
(2)试探讨
![](https://img.xkw.com/dksih/QBM/2016/9/13/1573017246253056/1573017252626432/STEM/bee720f506b342d09cca11e0c19d5f60.png)
![](https://img.xkw.com/dksih/QBM/2016/9/13/1573017246253056/1573017252626432/STEM/17fc8b948e8b47dbbb11b9f22c81fb5a.png)
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|
较难
(0.4)
名校
解题方法
【推荐2】已知
,
两点的坐标分别为
,
,直线
,
相交于点
,且它们的斜率之积为
,设点
的轨迹为曲线
.
(1)求曲线
的方程;
(2)设点
的坐标为
,直线
与曲线
的另一个交点为
,与
轴的交点为
,若
,
,试问
是否为定值?若是定值,请求出结果,若不是定值,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1803dc3c76fd2b51696647aa18602412.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afa482d7bcaa385bfc3548b42a4bfb60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/800c5e266b4ad8462a46970f0a232d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f46b053f98b1d05a2043e94eeaefea87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/354c3a283b2b21cc8ac33995aac20a5c.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)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edaef66a0582e95fb5c57a405acdea9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17128891cb59b33c76a0208f0fbd4f74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3f48f772f67a3f4503fed56843197b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febf7413b35cf2889fdb57a6b519087c.png)
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