题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034600-76492.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034600-18206.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034600-62631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034600-80321.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034601-81212.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034601-71530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034601-48245.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034601-30490.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034601-79349.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034602-56721.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034602-61460.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034602-19115.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034602-40419.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034602-43645.png)
解析
连接AE,则直角三角形AEB中,利用射影定理,可得到EF、AF,FB的关系式,,并利用三角形CDE与三角形EBF相似可以求解得到结论,
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034602-61460.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034602-19115.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034602-43645.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034555-73585.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034556-71313.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034556-24676.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034556-13993.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034555-73585.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034552-84879.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034552-41021.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034552-27520.png)
如图,
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034546-71506.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034547-81383.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034547-35408.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034547-11037.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034547-83257.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034547-91741.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034532-50197.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034532-99348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034533-32310.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034533-88516.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034533-31960.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034532-99348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034533-88413.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034534-52222.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034534-20554.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034534-96563.png)
(1)求动点
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034532-99348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034533-88413.png)
(2)设曲线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034533-88413.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034534-24939.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034534-69830.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034535-38678.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034535-77041.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034535-62177.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034535-83601.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034536-10743.png)
(3)若直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034536-68885.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034533-88413.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034536-39294.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034532-99348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034534-52222.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034536-59288.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034526-41312.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034526-85421.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034526-42350.png)
割线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034526-22276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034526-35486.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034527-27886.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034527-68112.png)
则⊙O的半径长为 .
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034527-78750.png)
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