题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194820-73884.png)
答案
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194820-26886.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194820-43205.png)
∵△EAC是等边三角形,
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194821-82136.png)
在Rt△ABO中,
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194821-99196.png)
∴DO=BO=3. ………………………………………………………3分
在Rt△EAO中,
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194821-97554.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194821-61681.png)
解析
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194753-63925.png)
A.4π | B.3π | C.2π | D.π |
A. S1 >S2 B. S1 < S2 C. S1 = S2 D.无法确定
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194742-42646.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194658-22163.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194659-52045.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194659-49757.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194659-25274.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194659-68816.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194659-74627.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194700-21211.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194700-38770.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194700-58627.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194700-52882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194701-40545.png)
小题1:求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194701-54329.png)
小题2:若
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194701-72322.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194702-98532.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194636-67349.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194637-22081.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194637-52980.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194637-61592.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194637-42321.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194638-87238.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194638-28059.png)
A.4 | B.3 | C.![]() | D.2 |
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029194638-54259.jpg)
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