题目
题型:不详难度:来源:
在
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164526-15577.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164526-42538.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164527-21164.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164527-97219.png)
(1)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164527-11750.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164527-39322.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164526-15577.png)
答案
解:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164528-24112.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164528-78504.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164528-51795.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164528-57572.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164529-92743.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164529-97065.png)
(2)由余弦定理
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164529-44701.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164529-48891.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164529-26099.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164530-27728.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164530-77400.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164530-65849.png)
解析
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164511-28325.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164511-63796.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164512-21991.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164512-91703.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164512-98949.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164441-92551.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164441-26849.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164408-65174.png)
(1)求角A; (2)若b+c=
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164408-65174.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164409-77387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164403-16981.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164403-67946.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164403-41601.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164404-65259.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164404-33762.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164404-26355.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164404-30401.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164405-45634.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164405-63044.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164405-32561.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164406-87161.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164406-27264.png)
在
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164320-40275.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164320-16854.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164320-85900.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164321-98394.png)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164321-60092.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164321-94445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019164321-31132.png)
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