已知圆C的方程为x2+(y﹣4)2=4,点O是坐标原点.直线l:y=kx与圆C交于M,N两点.
(Ⅰ)求k的取值范围;
(Ⅱ)设Q(m,n)是线段MN上的点,且
.请将n表示为m的函数.
(Ⅰ)求k的取值范围;
(Ⅱ)设Q(m,n)是线段MN上的点,且
![](https://img.xkw.com/dksih/QBM/2013/8/14/1571315481870336/1571315487178752/STEM/ccf2c4957d5f4cc089206158839efb68.png)
更新时间:2019-01-30 18:14:09
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【知识点】 直线与圆的位置关系
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解答题-问答题
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【推荐1】如图,已知圆
,动直线
过点
交圆
于
,
两点(点
在
轴上方),点
在
轴上,若点
的坐标为
,则点
的横坐标为
.
![](https://img.xkw.com/dksih/QBM/2015/7/14/1572180578344960/1572180583817216/STEM/713ffcf1-564c-4cf2-8843-5e0d20fcf7a2.png?resizew=167)
(1)求
的值;
(2)当直线
的斜率为
时,直线
与圆
相切,求点
的坐标;
(3)试问:是否存在一定点
,使得
总成立?若存在,请求出点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3285a2383fa18025034cf9876175295.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c9dcfd9f4c5298035870cb88a34169.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6ff82ebdfad5e7de1c7487b0b817a7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a53e311ee0b5085e7e5a45c606daa5d.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa2256b370007d4886fd2d79928166e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18a4c25fa7b7754fc55548e2497a9d6e.png)
![](https://img.xkw.com/dksih/QBM/2015/7/14/1572180578344960/1572180583817216/STEM/713ffcf1-564c-4cf2-8843-5e0d20fcf7a2.png?resizew=167)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
(2)当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/619096595112f0340a43b756e114dd3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(3)试问:是否存在一定点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d5ce23462dfd28929430b74b9590940.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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【推荐2】已知点
及圆C:
.
(1)求圆心C的坐标及半径r的大小;
(2)设过点Р的直线
与圆C交于M,N两点,当
时,求以线段MN为直径的圆Q的方程;
(3)设直线
与圆C交于A,B两点,是否存在实数a,使得过点
的直线
垂直平分弦AB?若存在,求出实数a的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9824ccb55f76cf3b0fd47aa2a45876a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9db1fea04fda2b8aec3893816bb990a.png)
(1)求圆心C的坐标及半径r的大小;
(2)设过点Р的直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e00ad067ceaf3a8c0452e5cd52a506.png)
(3)设直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5375e9cb3d83b66bba64998de3ad01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9824ccb55f76cf3b0fd47aa2a45876a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
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