解题方法
1 . 已知圆
截直线
的弦长为
.
(Ⅰ)求圆
的半径;
(Ⅱ)求
的值;
(Ⅲ)过点
作圆
的切线,求切线的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce9734f9b0b5665dfe31ab8102b388e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe567b482938a45840cf770053fd64fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa82a15632a545ce2cc6dc998899807.png)
(Ⅰ)求圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(Ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(Ⅲ)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c37eb03fe1df61a6056f0e3ab435a865.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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2 . 已知圆C:
.
(1)过点
向圆
引切线,求切线
的方程;
(2)若
为圆
上任意一点,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f5d967ad135991b6075ee45df55643.png)
(1)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2b337c32bd5408c0ed8a9ee9cde4cad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45ff7e0ef1f622120cc1b18e9d3e80ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9beaf7a39c5740e8016deb097e86d6e7.png)
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3 . 已知动点P到两个定点
的距离之比为
.
(1)求动点P的轨迹C的方程;
(2)若过点
的直线l与曲线相切,求直线l的方程;
(3)已知圆Q的圆心为
,且圆Q与x轴相切,若圆Q与曲线C有公共点,求实数t的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c9f6d91f04b1bad46c159500244874d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(1)求动点P的轨迹C的方程;
(2)若过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6868a51ea0a78f2605d3d1cbe701351b.png)
(3)已知圆Q的圆心为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de3dfcfbe5ef09dde0c3d9423b751c09.png)
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解题方法
4 . 根据下列条件求解.
(1)过点
且与圆
相切的直线方程;
(2)在平面直角坐标系中,经过三点
、
、
的圆的方程,并求圆心坐标和半径.
(1)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f684fa521109cc712c7a4703d51a785.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99e7b4acf5063db8a13d70dfe8badaee.png)
(2)在平面直角坐标系中,经过三点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b2c84e7b41a841a230ed5f8a42309aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29343388ca8b33dc98325e65382b38a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fab8a0cc6504aa4c3a38006f5394b4c2.png)
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解题方法
5 . 已知
,
,动点M满足
,设动点M的轨迹为C,
(1)求动点M的轨迹方程;
(2)求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/311497849126f1aaf1da0ec75602eabf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852b303689c31189cd47bb4a3220f9fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17b3b5e1dde66e11c8cd517ffa72b1b8.png)
(1)求动点M的轨迹方程;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02fe1b6f20cd9115202e23090f1ea9da.png)
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2020-12-11更新
|
311次组卷
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3卷引用:海南省海口市海南中学2020-2021学年高二上学期期中考试数学试题
名校
解题方法
6 . 如图,已知
的边
所在直线的方程为
,
满足
,点
在
边所在直线上且满足
.
![](https://img.xkw.com/dksih/QBM/2020/11/26/2601133284073472/2609618048966656/STEM/911dcc1e-58f5-4163-99cb-e0e496bd3a18.png)
(1)求
边所在直线的方程;
(2)求
外接圆的方程;
(3)求过
的
外接圆的切线方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18e93e741833eeaedeb7d0bb35c9e82c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/751bf4d00190b30344d20214aa72eac6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99296bab1b42898e7ca336a822510258.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35141e617bf4eff06d52e30b801902b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47151e4f21770c2e314963beac849e80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bf2d6e2c7bf59661de5c0fb75eb70c9.png)
![](https://img.xkw.com/dksih/QBM/2020/11/26/2601133284073472/2609618048966656/STEM/911dcc1e-58f5-4163-99cb-e0e496bd3a18.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18e93e741833eeaedeb7d0bb35c9e82c.png)
(3)求过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12796b93f8489abab501f6896d5359dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18e93e741833eeaedeb7d0bb35c9e82c.png)
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2020-12-08更新
|
514次组卷
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2卷引用:山东省济南市市中区实验中学2020-2021学年高二上学期期中数学试题
2020高三·全国·专题练习
解题方法
7 . 已知椭圆
(
)经过点
,且其右焦点为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/c4f88d0c-cc0a-4358-b5d0-f0e0c30ddefe.png?resizew=211)
(1)求椭圆的方程;
(2)若点
在圆
上,且在第一象限,过
作圆
的切线交椭圆于
、
两点,问:
的周长是否为定值?如果是,求出该定值;如果不是,说明理由.
![](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/41984061bc85409ba8384c6e5e2028bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/186f8fa19025d290ea370565a15f8216.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/c4f88d0c-cc0a-4358-b5d0-f0e0c30ddefe.png?resizew=211)
(1)求椭圆的方程;
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef74c4299221a967507c6a179337581a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef74c4299221a967507c6a179337581a.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/05c79511154d6256dab5d1d87cb0e181.png)
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2020-12-06更新
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1632次组卷
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6卷引用:专题52 平面解析几何专题训练-2021年高考一轮数学(文)单元复习一遍过
(已下线)专题52 平面解析几何专题训练-2021年高考一轮数学(文)单元复习一遍过(已下线)专题55 平面解析几何专题训练-2021年高考一轮数学单元复习一遍过(新高考地区专用)(已下线)第九单元 解析几何(B卷 滚动提升检测)-2021年高考数学(理)一轮复习单元滚动双测卷(已下线)专题55 平面解析几何专题训练-2021年高考一轮数学(理)单元复习一遍过(已下线)黄金卷03-【赢在高考·黄金20卷】备战2021年高考数学全真模拟卷(山东高考专用)(已下线)第3章 圆锥曲线的方程-2021-2022学年高二数学课后培优练(人教A版2019选择性必修第一册)
名校
8 . 已知圆
,过直线
上一动点P作圆的两条切线,切点分别为A,B.
(1)当有一条切线与坐标轴平行时,求另一条切线的方程;
(2)当圆切点弦所对的圆心角最小时,求
的值;
(3)记切线
,
分别交y轴于点S,T,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e1d1d4600ada48948a77e0ba1389cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4180dae966f648d368a10edf3b7e3c3.png)
(1)当有一条切线与坐标轴平行时,求另一条切线的方程;
(2)当圆切点弦所对的圆心角最小时,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4dfec890cdfdda355e19463f3be813.png)
(3)记切线
![](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/4a670d12554358604dc27abf2eaf1732.png)
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解题方法
9 . 阿波罗尼斯(约公元前262-190年)证明过这样一个命题:平面内到两定点距离之比为常数
(
且
)的点的轨迹是圆,后人将这个圆称为阿氏圆.已知动点
到点
与点
的距离之比为2,记动点
的轨迹为曲线
.
(1)求曲线
的方程;
(2)过点
作曲线
的切线,求切线方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0d68648b10fce54dfc19c5ee60086d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c525393775354325cbf7839366ca50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c850811ba59a05e945a665196539a048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf90f8358fa8cd9bc8c99ea48d9ae1a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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2020-12-04更新
|
577次组卷
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3卷引用:安徽省合肥市第十一中学2020-2021学年高二上学期期中数学(文)试题
解题方法
10 . 已知圆
经过点
,
,
.
(1)求圆
的方程;
(2)设点
为直线
:
上一点,过点
作圆
的两条切线,切点分别为
,
.若
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/383f12cb70ca55eba4ff012771dbfa9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b02af485e17e7628fd5a3ace6e0a32ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03add3189e2b3984c68146d0d95a963e.png)
(1)求圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65ccbfa4df4190907430bf37828edf34.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dddef81e3af08a62a69bc3e56a940bc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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2020-12-02更新
|
262次组卷
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2卷引用:山西省太原市2020-2021学年高二上学期期中质量监测数学试题