名校
1 . 已知圆
.
(1)若过点
向圆C作切线l,求切线l的方程;
(2)若Q为直线
上的动点,
是圆
上的动点,定点
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/997765e2c34222992649cb946218df55.png)
(1)若过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a436db19eb954d31075d5398f1b92ecd.png)
(2)若Q为直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b2a29cc492d67e2a8a46631f21245c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bf1bfd30237dce059d0107506d7be9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/350a38070bdc27207946be17d5f70223.png)
您最近一年使用:0次
名校
解题方法
2 . 已知圆
,则圆心坐标为________________ ,若直线
过点
且与圆
相切,则直线
的方程为__________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d338302118320a452616cfd0ae17f086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72480c8fae3dc057229a7958e9daed74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
您最近一年使用:0次