题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033947-44448.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033947-25193.png)
A.60° | B.120° | C.30° | D.60°或120° |
答案
解析
试题分析:根据题意,由于△ABC中,
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033947-44448.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033947-25193.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033947-37424.png)
点评:主要是考查了解三角形的运用,属于基础题。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033943-36822.png)
A.5 | B.6 | C.7 | D.8 |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033935-58203.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033936-31975.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033936-97717.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033936-15665.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033936-65627.jpg)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033936-35255.png)
(2)记BC的中点为D,求中线AD的长.
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033927-83094.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033927-99121.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033927-78418.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033927-60958.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033928-34306.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033928-74103.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033928-40236.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033928-93682.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033928-12803.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033929-16775.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033929-41166.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033927-99121.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033927-60958.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033914-93585.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033914-65579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033915-58457.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033915-59176.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033915-41809.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033915-34206.png)
(1)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033914-65579.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033915-66241.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033903-91737.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033903-81725.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033903-86641.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033903-43642.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033904-59395.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033904-83790.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033904-24844.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033904-79391.png)
(1)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033903-81725.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033905-68889.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020033905-23630.png)
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