题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033207-40215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033207-76136.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033207-53690.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033208-97172.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033208-65031.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033208-43135.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033208-81001.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033207-76136.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033209-51298.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033209-89273.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033209-45525.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033209-10377.png)
解析
试题分析: 做AO的延长线交圆于点E,那么则根据OA=2,则OB=2,且C是AB的中点,CA=OC=1,那么根据相交弦定理,可知DC
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033210-10221.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033210-10221.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033210-36127.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033210-91332.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033209-10377.png)
点评:解决该试题的关键是做辅助线,延长AO到点E,利用相交弦定理,得到变得关系式,然后求解得到结论。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033201-44570.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033201-85699.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033201-90695.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033201-35738.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033201-35738.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033201-44570.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033202-64137.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033201-35738.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033154-61911.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033155-61378.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033155-61035.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033155-50951.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033144-24938.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033144-81632.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033144-64142.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033144-80594.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033144-74670.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033145-52207.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033144-80594.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033145-97942.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033144-80594.png)
(1)求证:△
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033145-39107.png)
(2)设直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033145-90870.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033145-77321.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033145-64269.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033145-96370.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033145-92709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033146-96868.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023033139-98916.png)
A.(x-3)2+y2=25 | B.(x-3)2+y2=25或(x-7)2+y2=25 |
C.(x±3)2+y2=25 | D.(x+3)2+y2=25或(x+7)2+y2=25 |
A.1 | B.![]() | C.2![]() | D.3 |
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