设F为椭圆
的右焦点,过点
的直线与椭圆C交于
两点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/8b8184e2-279e-4e8d-8906-f3d8ea8c9f3f.png?resizew=257)
(1)若点B为椭圆C的上顶点,求直线
的方程;
(2)设直线
的斜率分别为
,
,求证:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/533b93dd6eb6b474481247736699c76c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a812a9b58ccba331cfd21d244329af01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/8b8184e2-279e-4e8d-8906-f3d8ea8c9f3f.png?resizew=257)
(1)若点B为椭圆C的上顶点,求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
(2)设直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7471451108cf5d0fbb66e8819759a6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ffd42503f1ab7e002e271fc58e036e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67351fe10fcfc3f9072eec4c60bfaaa5.png)
2021·江苏·一模 查看更多[9]
江苏省盐城市、南京市2021届高三下学期第一次模拟考试数学试题(已下线)专题15 圆锥曲线中的热点问题-备战2021年高考数学二轮复习题型专练(新高考专用)(已下线)数学-2021年高考考前20天终极冲刺攻略(三)(新高考地区专用)【学科网名师堂】 (5月30日)陕西省渭南市大荔县2021-2022学年高二上学期期末理科数学试题(已下线)专题39 圆锥曲线中的定点、定值问题-1陕西省西安市长安区第一中学2022-2023学年高二上学期期中文科数学试题陕西省西安市长安区第一中学2022-2023学年高二上学期期中理科数学试题河南省禹州市开元学校2022-2023学年高二上学期网课期中考试数学试题内蒙古包头市第四中学2022届高三下学期校内三模文科数学试题
更新时间:2021-04-01 18:55:59
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相似题推荐
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】已知椭圆
的中心为O,右顶点为A,在线段OA上任意选定一点
,过点M作与x轴垂直的直线交C于P,Q两点.
(1)设
,在OM的延长线上求一点N,使得
,
,
成等比数列,试证明直线PN,QN都是C的切线;
(2)通过解答(1),先猜想求过椭圆
上一点
的切线方程的一种方法,再加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69daca955a565fa537347dd0d93783f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/743896d1029ab253d93ce68397238dac.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0086b054ef120408acac806a1b1318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0c19fa4cd646f4d877c3e58cc346651.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c388f1f7160d3397610633dfde015fa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/146c403de6b5780cd03e25c775b806c6.png)
(2)通过解答(1),先猜想求过椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd54b9df3402ad91e2d34c40efe0c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f8cc85b8acaf72098912f7a63356561.png)
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【推荐2】如图,已知椭圆
的左、右焦点分别为
、
,点
为椭圆
上任意一点,
关于原点
的对称点为
,有
,且
的最大值
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/4c39172a-091a-4a64-b25c-99e86781c551.png?resizew=216)
(1)求椭圆
的标准方程;
(2)若
是
关于
轴的对称点,设点
,连接
与椭圆
相交于点
,直线
与
轴相交于点
,试求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.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/5963abe8f421bd99a2aaa94831a951e9.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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65cf08ae1fee1a42b7bf9ce09e38de68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62180fb2b68724b7b0f4f8337496c12a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/4c39172a-091a-4a64-b25c-99e86781c551.png?resizew=216)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cfec83404d339e89ccbe357b0a111fe.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/968b886a9f161fdcab1e08cba8ece5d0.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/828a6c0a00665863e522b39d31c773b9.png)
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【推荐1】已知椭圆
:
的离心率为
,长轴长为
,抛物线
:
,点
是椭圆
上的动点,点
是抛物线
准线上的动点.
(Ⅰ)求椭圆
的方程;
(Ⅱ)已知
(
为坐标原点),且点
到直线
的距离为常数,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](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/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c2f156b05838deaae6a35acad242af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
(Ⅰ)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
(Ⅱ)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc7df99fe6438442a9453fc0c57fb703.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
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【推荐2】椭圆
的左、右顶点分别为A,B,过点B作直线l交直线
于点M,交椭圆于另一点P.
(1)求该椭圆的离心率的取值范围;
(2)若该椭圆的长轴长为4,判断
是否为定值,若是,求出该定值,若不是,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f94afed5fb7c0e7c58f1f35dda0637ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/639c3d2ff5ee566fcc1b69c65712a661.png)
(1)求该椭圆的离心率的取值范围;
(2)若该椭圆的长轴长为4,判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09269d01ce45b25e4c52ee4a27af6206.png)
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