名校
1 . 已知圆
过点
,且圆心在直线
上.
(1)求圆
的方程;
(2)平面上有两点
,点
是圆
上的动点,求
的最小值;
(3)若
是
轴上的动点,
分别切圆
于
两点,试问:直线
是否恒过定点?若是,求出定点坐标,若不是,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f0a2bae9bd208168b7563e6a4bdc6d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abeb57d8e728c8d9bd15e8902b70a80.png)
(1)求圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)平面上有两点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf1b767b8f820ad859d32c1f29ebf379.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/e0bcc5620e4388c9d31eb7955fcd589f.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2df2041df1584df872874978ee795e81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbbbc9c5353894f2c93c205c3ac04f03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08cce6cac0fdd4b1a434af8bcaec8fef.png)
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2019-09-11更新
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1592次组卷
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2卷引用:天津市六校2018-2019高一下学期期末联考数学试题