题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222522-27500.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222522-36327.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222523-96169.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222523-46222.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222523-46222.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222522-27500.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222523-23269.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222523-88284.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222523-14881.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222523-88882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222523-46222.png)
(2)若点
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222523-46222.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222523-49681.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222523-46222.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222522-27500.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222523-25494.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222523-42301.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222523-24515.png)
(3)求证:经过
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222524-82820.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222522-27500.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222522-27500.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222524-31318.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222524-91189.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222524-90907.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222524-89499.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222524-59971.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222525-48447.png)
解析
试题分析:(1)由题中条件,在直角三角形
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222525-65529.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222525-20582.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222525-90648.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222525-20582.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222525-59815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222523-46222.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222523-24515.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222523-24515.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222525-33231.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222525-66725.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222525-90648.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222524-82820.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222525-19587.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222525-59815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222526-24924.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222524-82820.png)
试题解析:(1)由条件可得
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222526-78656.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222525-90648.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222526-92578.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222526-76658.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222526-99958.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222524-31318.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222524-91189.png)
(2)由已知圆心到直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222523-24515.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222526-20079.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222523-24515.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222525-33231.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222526-12985.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222526-96127.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222527-56301.png)
所以直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222523-24515.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222524-90907.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222524-89499.png)
(3)设
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222525-90648.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222524-82820.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222525-19587.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222527-26255.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222527-84411.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222528-61182.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222528-15138.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222528-34093.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222528-76677.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222524-59971.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222525-48447.png)
核心考点
试题【已知圆的方程为:,直线的方程为,点在直线上,过点作圆的切线,切点为.(1)若,求点的坐标;(2)若点的坐标为,过点的直线与圆交于两点,当时,求直线的方程;(3)】;主要考察你对点到直线的距离等知识点的理解。[详细]
举一反三
A.x-2y+1=0 | B.x+2y-3=0 |
C.2x+y-3=0 | D.2x-y-1=0 |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222513-12349.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222513-54502.jpg)
(1)求圆C的方程;
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222507-23163.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222508-66983.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222459-11230.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222459-69156.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222459-51125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222500-54516.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222453-62646.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022222453-58912.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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