解题方法
1 . 我国著名数学家华罗庚曾说:“数缺形时少直观,形少数时难入微,数形结合百般好,隔离分家万事休.”事实上,很多代数问题可以转化为几何问题加以解决,已知曲线C上任意一点
满足
.
(1)化简曲线
的方程;
(2)已知圆
(
为坐标原点),直线
经过点
且与圆
相切,过点A作直线
的垂线,交
于
两点,求
面积的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee82283f06cedef32eb15b87964f5d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46aff8e3b59d5256a3ae074c5892ef5a.png)
(1)化简曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)已知圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/560adea7b0d4fbe4131fc41f3fcbd871.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/1ac9e97e93b5c8704137de074b3890cb.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25dd698d57d1cf239eb8752aecaaa4f4.png)
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2023高三·全国·专题练习
2 . 下面是某同学在学段总结中对圆锥曲线切线问题的总结和探索,现邀请你一起合作学习,请你思考后,将答案补充完整.
(1)圆
上点
处的切线方程为 .理由如下: .
(2)椭圆
上一点
处的切线方程为 ;
(3)
是椭圆
外一点,过点
作椭圆的两条切线,切点分别为A,B,如图,则直线
的方程是 .这是因为在
,
两点处,椭圆
的切线方程为
和
.两切线都过
点,所以得到了
和
,由这两个“同构方程”得到了直线
的方程;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/45269108-eb93-4c60-9b19-e966e77c8034.png?resizew=309)
(4)问题(3)中两切线
,
斜率都存在时,设它们方程的统一表达式为
,由
,得
,化简得
,得
.若
,则由这个方程可知
点一定在一个圆上,这个圆的方程为 .
(5)抛物线
上一点
处的切线方程为
;
(6)抛物线
,过焦点
的直线
与抛物线相交于A,B两点,分别过点A,B作抛物线的两条切线
和
,设
,
,则直线
的方程为
.直线
的方程为
,设
和
相交于点
.则①点
在以线段
为直径的圆上;②点
在抛物线
的准线上.
(1)圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cd432589cb00c29cac1806288e99ed0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22962a2ad892cb6b14ab039a06e8cdc6.png)
(2)椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23b4f86e48e2b0d63c1865c60ed1e4d1.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b21872d8f6a518e0a2993ccf7a795ed2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc19b2381300bcb0920fb86b2976098a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a3efb79f35db8448f3391252ab7d4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df332f01628130c084fd46aaca0a4b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cac5cb33767f3bea3a7d99f995e48755.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ac254ffeb189342bf397010c97f9167.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b401183b99948a51c9e005c85951a823.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43091ed6e1c36fbfd8e8799ce12a5973.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/45269108-eb93-4c60-9b19-e966e77c8034.png?resizew=309)
(4)问题(3)中两切线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb05438f51bde5d82b255acf92987b74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69c79938f3fa4f4b641f3b404cf86647.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08f0d24f0e0d63565b7a0199829a311b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c2b0eb6b8e515c616b5cdd4c37fefc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74c80c76cbb6f2710c0af6bdf4c0c954.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83640592853a53872d7af69c0cffc1bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(5)抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3764ba3aa0a241787f4661026bb14053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23b4f86e48e2b0d63c1865c60ed1e4d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e852c2da5b495f05306d402d8a938d8a.png)
(6)抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc7ad3432ac96b0a38beaa7f2edc3499.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.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/12a3efb79f35db8448f3391252ab7d4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df332f01628130c084fd46aaca0a4b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/858ae1eafc5d1e6c42b68154b8dce9aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30bb870cc3bf94e834b4ca8ed99609a3.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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名校
解题方法
3 . 已知椭圆
的两个焦点与短轴的一个端点连线构成等边三角形,且椭圆
的短轴长为
.
(1)求椭圆
的标准方程;
(2)是否存在过点
的直线
与椭圆
相交于不同的两点
,且满足
(
为坐标原点)若存在,求出直线
的方程;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)是否存在过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c10f14aae6fb21e047ecb39cdf40c0.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/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef10b20903796c7d952b978a02b40da8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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2024-01-06更新
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16卷引用:吉林省长春市第十一高中、东北师范大学附属中学、吉林一中,重庆一中等五校2018届高三1月联合模拟考数学(文)试题
吉林省长春市第十一高中、东北师范大学附属中学、吉林一中,重庆一中等五校2018届高三1月联合模拟考数学(文)试题(已下线)2021年新高考北京数学高考真题变式题16-21题(已下线)第46讲 范围、最值、定点、定值及探索性问题(讲) — 2022年高考数学一轮复习讲练测(课标全国版)(已下线)专题31 圆锥曲线存在性问题的五种类型大题100题-【千题百练】2022年新高考数学高频考点+题型专项千题百练(新高考适用)(已下线)专题43 盘点圆锥曲线与平面向量交汇问题——备战2022年高考数学二轮复习常考点专题突破四川省眉山市东坡区眉山北外附属东坡外国语学校2023届高三下学期开学考试文科数学试题四川省成都市石室阳安中学2024届高三上学期12月月考数学(文)试题江西省上饶市广丰贞白中学2024届高三上学期1月考试数学试题江西省新余市第四中学2021届高三上学期第一次段考数学(理)试题湖南省常德市石门县第六中学2020-2021学年高二下学期第一次月考数学试题甘肃省武威第六中学2020届高三下学期第二次诊断考试数学(理)试题广西桂林市2021-2022学年高二11月月考数学试题(已下线)专题3.2 圆锥曲线与方程 章末检测2(中)-【满分计划】2021-2022学年高二数学阶段性复习测试卷(苏教版2019选择性必修第一册)吉林省辽源市田家炳高中友好学校(第七十六届)2023-2024学年高二上学期1月期末联考数学试题山东省烟台爱华高级中学2023-2024学年高二上学期期末模拟数学试题(二)B卷山东省潍坊市国开中学2023-2024学年高二下学期开学收心数学试题
解题方法
4 . 已知动点
满足:
(其中
).
(1)指出动点
的轨迹
是何种曲线,并化简其方程;
(2)当
时,若过点
的直线
和曲线
相交于
两点,且
为线段
的中点,求直线
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45ff7e0ef1f622120cc1b18e9d3e80ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88927a5c8dfa3414f5a82e83f7ccc531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3be362dec96173f246ff747264007817.png)
(1)指出动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e260f5fe6e3637a415344ff137c7a6be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9deb20b57fe0b94ca8520b55298d6c4a.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/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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