题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045043-40522.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045044-85410.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045044-54108.png)
小题1:证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045044-35591.png)
小题2:若
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045044-99971.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045044-90386.png)
答案
小题1:∵AB是直径,
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045044-54108.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045045-31532.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045045-55672.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045045-71345.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045044-35591.png)
小题2:∵
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045044-99971.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045045-91263.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045046-74035.png)
解得:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045046-94815.png)
解析
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045038-26781.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045038-79947.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045039-71354.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045039-73041.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045039-81673.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045040-91272.png)
A.3≤OM≤5 | B.4≤OM≤5 | C.3<OM<5 | D.4<OM<5 |
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045035-80926.png)
A.
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045031-21453.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045031-36425.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045031-91919.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045031-43918.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045031-75875.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045024-45987.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045024-18609.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045024-89088.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045024-89088.png)
(2)若EB=
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045025-61136.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105045025-42162.png)
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