已知圆
的圆心在
轴的正半轴上,半径为2.且被直线
截得的弦长为
.
(1)圆
的方程;
(2)设
是直线
上动点,过点
作圆
的切线
,切点为
,证明:经过
,
,
三点的圆必过定点,并求所有定点坐标.
![](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/d12c4c4fc3f304cbe608313acbbf05ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
(1)圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfab8f6aaf05b1db2db85b60362f3047.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/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
19-20高二下·内蒙古赤峰·期末 查看更多[4]
内蒙古赤峰市2019-2020学年下学期期末高二年级学年联考试卷(A)理科数学(已下线)第2章 圆与方程(基础卷)-2021-2022学年高二数学新教材单元双测卷(苏教版2019选择性必修第一册)(已下线)专题2-2 直线系方程与圆系方程四川省宜宾市宜宾市第一中学校2023-2024学年高二上学期期中数学试题
更新时间:2020-09-02 22:52:45
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解答题-证明题
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适中
(0.65)
名校
【推荐1】已知曲线
:
.
(1)当
取何值时,方程表示圆?
(2)求证:不论
为何值,曲线
必过两定点.
(3)当曲线
表示圆时,求圆面积最小时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fb30ff5187ccfd4ce47225e84dcdde7.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)求证:不论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(3)当曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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适中
(0.65)
【推荐2】已知点E在椭圆
上,以E为圆心的圆与x轴相切于椭圆C的右焦点
,与y轴相交于A,B两点,且
是边长为2的正三角形.
(Ⅰ)求椭圆C的方程;
(Ⅱ)已知圆
,设圆O上任意一点P处的切线交椭圆C于M、N两点,试判断以
为直径的圆是否过定点?若过定点,求出该定点坐标,并直接写出
的值;若不过定点,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3814287dbb60d478bffc5366f9928b.png)
(Ⅰ)求椭圆C的方程;
(Ⅱ)已知圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74417b1efc8cb75c7f34a94b4e9c8a6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e177345aea68c21205d3ff3107eb1f03.png)
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名校
【推荐1】过点
作直线
,当
的斜率为何值时.
(1)
将圆
平分?
(2)
与圆
相切?
(3)
与圆
相交且所截得弦长
?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/111fc953684b51df437ef2bc02290ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39ec0af5341e1709698f5cdf52c1e06b.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39ec0af5341e1709698f5cdf52c1e06b.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39ec0af5341e1709698f5cdf52c1e06b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0204f76cda5ea4ced714588be1efeaa.png)
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解题方法
【推荐2】已知圆C的圆心在直线
上,且经过点
,
.
(1)求圆C的标准方程;
(2)直线l过点
且与圆C相交,所得弦长为
,求直线l的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2297db3c14c256b9691fbb8e5bba978.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/215cf9cfac95af95708707f14438675f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1e5eea5f7f98ca8632358b7e49ceb25.png)
(1)求圆C的标准方程;
(2)直线l过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f13bf66fc845b115de4ec45b4be0e23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b10e8abf8690e4b129466ddb918bcc94.png)
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