名校
解题方法
1 . 设
分别是椭圆![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c91e805ed85d924f9390dd934f606ba.png)
的左、右焦点,
是
上一点,
与
轴垂直.直线
与
的另一个交点为
,且直线
的斜率为
.
(1)求椭圆
的离心率;
(2)设
是椭圆
的上顶点,过
任作两条互相垂直的直线分别交椭圆
于
两点,证明直线
过定点,并求出定点坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c91e805ed85d924f9390dd934f606ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7334bdc080ea1ee4456889f56416a318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/183b6a0cef4256c9696a5bca31053da5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b67528f875a6d4bac8bbf784f7b66a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/821309f088a175c00dc0f4828334503d.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bdfbae913ff7ff8caaefcaacf8c20ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5725e3e4eb05b32563b4ee1d473756c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
2022-10-06更新
|
1629次组卷
|
5卷引用:河南省顶级名校2022-2023学年高三上学期第一次月考试卷数学(文)试题
河南省顶级名校2022-2023学年高三上学期第一次月考试卷数学(文)试题(已下线)专题31 圆锥曲线的垂直弦问题-1天津外国语大学附属外国语学校2023届高三上学期10月月考数学试题(已下线)重难点突破08 圆锥曲线的垂直弦问题 (八大题型)广西百色市平果市铝城中学2024届高三下学期4月月考数学试卷
名校
解题方法
2 . 已知
,
为
的两个顶点,
为
的重心,边
,
上的两条中线长度之和为6.
(1)求点
的轨迹
的方程;
(2)若直线
与曲线
相交于点
、
,若线段
的中点是
,求直线
的方程;
(3)已知点
,
,
,直线
与曲线
的另一个公共点为
,直线
与
交于点
,求证:当点
变化时,点
恒在一条定直线上.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d42f05b013e4b7166cbc87c5a83d6a85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca0b4afd16b79370532de44989d6c43d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bcd8ee2d8367c167d6ae0abc741b6b8.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bcd8ee2d8367c167d6ae0abc741b6b8.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/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bac7c28099bfbb7dc2a45ad166eace05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(3)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80e226b2b5fa8e31e6a12482a7e63e92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dad483f961dc9d4c1516cf9f60138c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be92f0e0012a7696c78e3e00513edefd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.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/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632917e61f4208959686d118c7f19231.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
您最近一年使用:0次
2023-03-18更新
|
771次组卷
|
3卷引用:上海市七宝中学2023届高三下学期开学考试数学试题
3 . 在平面直角坐标系
中,已知椭圆
的离心率为
,两个顶点分别为
.过点
的直线交椭圆于
两点,直线
与
的交点为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/6/bf946c41-27fb-49a8-a793-5d43614b26a9.png?resizew=257)
(1)当直线
的斜率为1时,若椭圆上恰有两个点
使得
和
的面积为
,求
的取值范围;
(2)求证:点
在一条定直线上.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e066c6068538d8e74fe8eead24b1879c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d776a89f4fd29dccffe1040069d59ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9399c9a2a31b0e3165aea2d6ccc4f7c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a439c8a01a6626d7a3f53af31ef0bcae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/6/bf946c41-27fb-49a8-a793-5d43614b26a9.png?resizew=257)
(1)当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5425108c557f0f21474c045334f97d9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2793a649954fbb40a20100114cc507f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/100b1ccc184ffe9d444ac54010a9fbec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(2)求证:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
您最近一年使用:0次
名校
解题方法
4 . 已知椭圆
的离心率为
,以C的短轴为直径的圆与直线
相切.直线l过右焦点F且不平行于坐标轴,l与C有两交点A,B,线段
的中点为M.
(1)求C的方程;
(2)证明:直线
的斜率与l的斜率的乘积为定值;
(3)延长线段
与椭圆C交于点P,若四边形
为平行四边形,求此时直线l的斜率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851a5d6ec23256f9b4a9e98aa92945fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8591c458c5675e87f9f9f8ac2b710ea9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(1)求C的方程;
(2)证明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
(3)延长线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14e902eb263971b466d0fcd91c56b453.png)
您最近一年使用:0次
解题方法
5 . 已知椭圆
:
(
)的左,右焦点为
,
,离心率为
,点
是椭圆
上不同于顶点的任意一点,射线
,
分别与椭圆
交于点
,
,
的周长为8.
(1)求椭圆
的标准方程;
(2)求证:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.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/9ac86e1c253297a377e14fb9a1689be8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0739793f234f8e86adc6177801ae7295.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/8144da365530cc0560de2d4946c96a1d.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e5a29b7ed0c415987dfc800850231a2.png)
您最近一年使用:0次
名校
6 . 已知椭圆
的离心率为
,且经过点
.
(1)求椭圆
的方程;
(2)若
,
分别为椭圆
的上顶点和右焦点,直线
与椭圆
交于点
,
,
到直线
,
的距离分别为
和
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851a5d6ec23256f9b4a9e98aa92945fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/075ba8c6fb5ef7288cd3fed425c8e69e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e93c13c9d1a1f85ab7a9b044c669bf53.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca66a268d6f46e0e9d5d9151b785be60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20b051a4b4dd6830cab05894b15898e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5edf900c810371fb21297c15f86d8743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31ac1def558351e2e3ed1235c570530.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bc82280a60309e03d58340025a43cff.png)
您最近一年使用:0次
2023-07-27更新
|
743次组卷
|
3卷引用:重庆市巴蜀中学校2024届高三上学期适应性月考(一)数学试题
名校
解题方法
7 . 已知椭圆
长轴的两个端点分别为
,离心率为
.
(1)求椭圆
的方程;
(2)
为椭圆
上异于
的动点,直线
分别交直线
于
两点,连接
并延长交椭圆
于点
.
(ⅰ)求证:直线
的斜率之积为定值;
(ⅱ)判断
三点是否共线,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1e44e2b3635b65b4cbea0040b4151ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)
![](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/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b6074284a3d33225adde446bed11b79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fb489e91a4b601413959b0954531df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c023f4b501684abd869b36d6e6c7f21f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
(ⅰ)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58253cb9f9e49358a27dd92b47539b02.png)
(ⅱ)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcc99d8e525e2dcba8895be2169ad0ef.png)
您最近一年使用:0次
2021-03-27更新
|
2572次组卷
|
11卷引用:北京市丰台区2021届高三一模数学试题
北京市丰台区2021届高三一模数学试题(已下线)必刷卷06-2021年高考数学考前信息必刷卷(江苏专用)(已下线)预测卷04-2021年高考数学金榜预测卷(山东、海南专用)天津市河西区2021届高三下学期总复习质量调查(三)数学试题北京市东直门中学2020-2021学年高二下学期期中数学试题(已下线)解密18 椭圆(分层训练)-【高频考点解密】2021年高考数学(理)二轮复习讲义+分层训练广东省广州市华南师范大学附属中学2022届高三上学期第三次月考(11月)数学试题北京市顺义区第一中学2022-2023学年高二上学期期中考试数学试题河南省信阳市普通高中2022-2023学年高三第二次教学质量检测数学(文科)试题河南省信阳市普通高中2022-2023学年高三第二次教学质量检测数学(理科)试题北京市东直门中学2024届高三上学期阶段检测(10月月考)数学试题
解题方法
8 . 已知椭圆C:
的离心率为
,右焦点
与抛物线
的焦点重合.
(1)求椭圆C的方程;
(2)设椭圆C的左焦点为
,过点
的直线l与椭圆C交于
两点,A关于x轴对称的点为M,证明:
三点共线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd54b9df3402ad91e2d34c40efe0c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1174142f3bba761585b6bc2653009b36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/697c20fca284394bf5d5b9e5f6d952e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ac62b1ade07205ae2693ec1ab135def.png)
(1)求椭圆C的方程;
(2)设椭圆C的左焦点为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73609bec825b1b14eeb5bd11d66fe3f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/007b2cd470aaecd28839d8f778ae9dd2.png)
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2023-02-28更新
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770次组卷
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5卷引用:陕西省西安市周至县2023届高三下学期一模文科数学试题
陕西省西安市周至县2023届高三下学期一模文科数学试题陕西省西安市周至县2023届高三下学期一模理科数学试题青海省西宁市2023届高三一模理科数学试题青海省西宁市2023届高三一模文科数学试题(已下线)重难点突破10 圆锥曲线中的向量问题(五大题型)
名校
解题方法
9 . 已知椭圆
上任意一点到两个焦点
,
的距离的和为4.经过点
且不经过点
的直线与椭圆C交于P,Q两点,直线
与直线
交于点E,直线
与直线
交于点N.
(1)求椭圆C的标准方程;
(2)求证:
的面积为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bb4a7482cb81b34df5a11807b8136a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60cfc83cab6cd17842f28b9c37836673.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23ee8669bc280bff4b20644cb82faf23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48d25e70d37af93796965efc8d342185.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2dca049735b45fb9b2533c68605eddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
(1)求椭圆C的标准方程;
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c48e42ce4fd7e6da946bf2b7b22200db.png)
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2023-02-22更新
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707次组卷
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2卷引用:天津市南开区2022-2023学年高二上学期1月阶段性质量监测数学试题
解题方法
10 . 已知A′,A分别是椭圆C:
(a>b>0)的左、右顶点,B,F分别是C的上顶点和左焦点.点P在C上,满足PF⊥A′A,AB∥OP,|FA′|=2
.
(1)求C的方程;
(2)过点F作直线l(与x轴不重合)交C于M,N两点,设直线AM,AN的斜率分别为k1,k2,求证:k1k2为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9db9373e74ecf5d63ad98afe66aa4ba.png)
(1)求C的方程;
(2)过点F作直线l(与x轴不重合)交C于M,N两点,设直线AM,AN的斜率分别为k1,k2,求证:k1k2为定值.
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