在平面直角坐标系
中,圆
:
.
(1)
为直线
:
上一点.
①若点
在第一象限,且
,过点
作圆
的切线,求切线方程;
②若存在过点
的直线交圆
于点
,且
恰为线段
的中点,求点
纵坐标的取值范围;
(2)已知
,
为圆
上任一点,求一定点
(异于点
),使
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f240cccaf24af8a796abb95cb42be52e.png)
(1)
![](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/5b028286277ca44bf85a50ef447dbfd6.png)
①若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/616c25ef280e91a181807bfd66b10898.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
②若存在过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84a56e5ddc6dc057aa4076130cc6ce19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/532fd707f04337e9cb109e6202d32298.png)
19-20高一下·江苏苏州·期中 查看更多[2]
江苏省苏州市高新区第一中学2019-2020学年高一下学期期中数学试题(已下线)专题06 《圆与方程》中的压轴题(2)-2021-2022学年高二数学同步培优训练系列(苏教版2019选择性必修第一册)
更新时间:2020-07-15 19:24:01
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解答题-证明题
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解题方法
【推荐1】在平面直角坐标系xOy中,过坐标原点O的圆M(圆心M在第一象限)与x轴正半轴交于点A(2,0),弦OA将圆M截得两段圆弧的长度比为1:5.
(1)求圆M的标准方程;
(2)设点B是直线l:
x+y+2
0上的动点,BC、BD是圆M的两条切线,C、D为切点,求四边形BCMD面积的最小值;
(3)若过点M且垂直于y轴的直线与圆M交于点E、F,点P为直线x=5上的动点,直线PE、PF与圆M的另一个交点分别为G、H(GH与EF不重合),求证:直线GH过定点.
(1)求圆M的标准方程;
(2)设点B是直线l:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4d1cbf4c738326155ce01140352403c.png)
(3)若过点M且垂直于y轴的直线与圆M交于点E、F,点P为直线x=5上的动点,直线PE、PF与圆M的另一个交点分别为G、H(GH与EF不重合),求证:直线GH过定点.
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【推荐2】在平面直角坐标系
中,已知点
,圆
与
轴的正半轴交点为
,过点
的直线
与圆
交于不同两点
、
.
(1)动圆过点
且与圆
外切,求动圆圆心
的轨迹方程(只需求出轨迹方程,无需限制范围);
(2)设直线
、
的斜率分别为
、
,求证:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/497911bc462170183e81d95bd509b70b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79382ba44ba669b5d43fdd5427adf16c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(1)动圆过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)设直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf25e032b5599ac49383de06e776365.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf702adb116c1e46569eb7050d029f49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b69e3f7ddd51215d00661c09cd900d60.png)
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【推荐1】已知圆C:x2+(y+4)2=4,P是直线y=4上的动点.
(1)若P(2,4),过点P作圆C的切线,求切线的方程;
(2)是否存在经过点P的直线l与圆C相交于M,N两点,且使得点(–1,–3)为线段MN的中点?若存在,求出直线l的方程;若不存在,请说明理由.
(1)若P(2,4),过点P作圆C的切线,求切线的方程;
(2)是否存在经过点P的直线l与圆C相交于M,N两点,且使得点(–1,–3)为线段MN的中点?若存在,求出直线l的方程;若不存在,请说明理由.
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解答题-证明题
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【推荐2】已知圆
和点
.
(1)过M作圆O的切线,求切线的方程;
(2)过M作直线l交圆O于点C,D两个不同的点,且CD不过圆心,再过点C,D分别作圆O的切线,两条切线交于点E,求证:点E在一条定直线上,并求出该直线的方程;
(3)已知
,设P为满足方程
的任意一点,过点P向圆O引切线,切点为B,试探究:平面内是否存在一定点N,使得
为定值?若存在,则求出定点N的坐标,并指出相应的定值;若不存在,则说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/560adea7b0d4fbe4131fc41f3fcbd871.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e8e445500f8a9de2c8ead8b2f24b1fc.png)
(1)过M作圆O的切线,求切线的方程;
(2)过M作直线l交圆O于点C,D两个不同的点,且CD不过圆心,再过点C,D分别作圆O的切线,两条切线交于点E,求证:点E在一条定直线上,并求出该直线的方程;
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a6be776cdd229e5c1339265b23624a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82324edc595f52ce442f919872b3ea49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fce564bd898ee14b70791f5fccbcc0f.png)
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【推荐1】已知圆
,圆
,动圆
与圆
内切并且与圆
外切,圆心
的轨迹为曲线
.
(1)求
的方程;
(2)已知曲线
与
轴交于
两点,过动点
的直线与
交于
(不垂直
轴),过
作直线交
于点
且交
轴于点
,若
构成以
为顶点的等腰三角形,证明:直线
的斜率之积为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/495caca9b99fa6f5a2774aeadfaa40f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59e1a96ac2c02f596c1e6e43c7f4daee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)已知曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57a4409ae49af42dea887c82f168a9c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/301a79da0ddb6d1943d7522b675ba1aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e4d7503a7d57ba242ad4e05c7006a0.png)
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【推荐2】已知圆
与圆
相切.
(1)求圆
的半径
;
(2)若圆
与圆
相内切, 设圆
与
轴的负半轴的交点为
, 过点
作两条斜率之积为-3的直线
, 分别交圆
于
两点, 求点
到直线
距离的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3285a2383fa18025034cf9876175295.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f11583d5a9d06b238a94e3f24c8aa41b.png)
(1)求圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
(2)若圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44434b647ec546fe787e2164e0be6cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
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