题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050518-35186.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050518-92080.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050518-35726.gif)
弦长为
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050518-40746.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050519-14842.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050519-76077.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050519-33745.gif)
圆心到直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050518-35726.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050519-59258.gif)
依题意,有
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050519-49238.gif)
解此方程组,得
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050520-96643.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050520-73944.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050520-83615.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050520-29507.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050521-83566.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050520-83615.gif)
所以,所求的圆的方程有两个,它们分别是
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050519-14842.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050519-76077.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050513-30807.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050514-22654.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050514-55325.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050514-53825.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050514-28932.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050514-53146.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050514-22654.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050505-81673.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050505-90277.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050506-21287.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050506-43563.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050505-81673.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050458-26043.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050459-84386.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050459-82464.gif)
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![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050448-18678.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050448-64839.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050448-15547.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050448-91318.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050448-18678.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050448-22414.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050448-66841.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050441-55940.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023050441-40342.gif)
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