题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002515-90715.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002515-44634.gif)
(1)若直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002515-84626.gif)
(2)是否存在直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002515-84626.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002515-84626.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002515-84626.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002515-65127.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002515-31551.gif)
若直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002515-84626.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002515-53807.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002515-84626.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002515-45848.gif)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002515-34723.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002515-18201.gif)
(2)设存在满足条件的直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002515-84626.gif)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002516-51569.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002516-60318.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002516-28299.gif)
设直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002515-84626.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002516-47490.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002516-98374.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002517-49219.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002517-41238.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002517-57854.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002517-79487.gif)
由题意有:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002518-18969.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002518-87637.gif)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002518-54038.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002518-37730.gif)
将(2)代入(3)得:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002518-86355.gif)
解得:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002519-95159.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002519-26644.gif)
所以满足条件的直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002515-84626.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002519-27892.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002519-38422.gif)
解析
核心考点
试题【已知圆C:,直线.(1)若直线与圆C相切,求实数b的值;(2)是否存在直线,使与圆C交于A、B两点,且以AB为直径的圆过原点.如果存在,求出直线的方程,如果不存】;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
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002510-55340.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002504-17200.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002504-89092.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002456-75447.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002456-65329.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002453-46535.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002453-75676.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002453-71558.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002453-88606.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002454-54249.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023002447-10942.png)
A.4 B.8 C.9 D.18
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