如图,在平面直角坐标系
中,已知
是椭圆
的右焦点,
是椭圆
上位于
轴上方的任意一点,过
作垂直于
的直线交其右准线
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/0a4109a7-1049-46c1-9996-783801d0ed9e.png?resizew=191)
(1)求椭圆
的方程;
(2)若
,求证:直线
与椭圆
相切;
(3)在椭圆
上是否存在点
,使四边形
是平行四边形?若存在,求出所有符合条件的点
的坐标:若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1fe51388687c89cd24c2b4c976c806e.png)
![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdbd8a5d973b7a54b7605388fdcfbb07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/0a4109a7-1049-46c1-9996-783801d0ed9e.png?resizew=191)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ef8b6aaff2f2153c6f9751fc5fd7034.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(3)在椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82430e79bf84708a2d007c440c042266.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
2020·江苏南通·二模 查看更多[2]
更新时间:2020-05-01 13:15:39
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相似题推荐
解答题-问答题
|
较难
(0.4)
解题方法
【推荐1】已知椭圆
的长轴长为
,右焦点F(1,0),过F作两条互相垂直的直线分别交椭圆G于点A,B和C,D,设AB,CD的中点分别为P,Q.
(1)求椭圆G的方程;
(2)若直线AB,CD的斜率均存在,求
的最大值,并证明直线PQ与x轴交于定点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f729f918900b215c9721da1b44efdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
(1)求椭圆G的方程;
(2)若直线AB,CD的斜率均存在,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9cbc334d6f4b6f92ffdeba67ca441b8.png)
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【推荐2】已知椭圆
的离心率e满足
,以坐标原点为圆心,椭圆C的长轴长为半径的圆与直线
相切.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/06b9ef78-a22c-4d39-b7d4-6f3f619018e5.png?resizew=169)
(1)求椭圆C的方程;
(2)过点P(0,1)的动直线
(直线
的斜率存在)与椭圆C相交于A,B两点,问在y轴上是否存在与点P不同的定点Q,使得
恒成立?若存在,求出定点Q的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851a5d6ec23256f9b4a9e98aa92945fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4168f0c32d668de9e343f3bad8acc5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc32d062a544c3de3eb80729e6425eff.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/06b9ef78-a22c-4d39-b7d4-6f3f619018e5.png?resizew=169)
(1)求椭圆C的方程;
(2)过点P(0,1)的动直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f802b7c63badf91a55c6cd379179a64.png)
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解答题-证明题
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名校
【推荐1】已知椭圆
的左右顶点为A,B,点P,Q为椭圆上异于A,B的两点,直线
与直线
的斜率分别记为
,且
.
(Ⅰ)求证:
;
(Ⅱ)设
,
的面积分别为
,
,判断
是否为定值,若是求出这个定值,若不是请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb4402aeb853b22f20992156957ef0fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90963760acac7bfad3ae03088c6c80b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0aea8e4a6e524f43f9a13c1ef4fbddd.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85e4cb1a0ea1b684e80129f2415ef2e4.png)
(Ⅱ)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecc3919b5000f9af77ddb77a62bee9c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac4a21bd60e845809b6d05c34e1df56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f0a6fb218d28383e6f27f2df1f50f.png)
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【推荐2】已知O为坐标原点,
,
,直线AG,BG相交于点G,且它们的斜率之积为
.记点G的轨迹为曲线C.
(1)若射线
与曲线C交于点D,且E为曲线C的最高点,证明:
.
(2)直线
与曲线C交于M,N两点,直线AM,AN与y轴分别交于P,Q两点.试问在x轴上是否存在定点T,使得以PQ为直径的圆恒过点T?若存在,求出T的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd99c5000629d7f49499d666e68f40d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852b303689c31189cd47bb4a3220f9fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78fd95f89dec2d373fa57f02acd739f.png)
(1)若射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/324ea5e0df953d5f200bd654f2b724f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f14f4edc0f4f1860043605d8eb958921.png)
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27f5009709cb959ee06ac660f6e4f88f.png)
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