题目
题型:不详难度:来源:
在锐角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055823-67134.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055823-39368.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055823-77018.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055823-38891.gif)
(Ⅰ)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055824-31233.gif)
(
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055824-94669.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055824-32821.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055823-67134.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055824-62168.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055824-15341.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055824-59933.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055824-58917.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055824-33295.gif)
得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055825-77859.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055825-90139.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055825-77728.gif)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055825-26977.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055825-51208.gif)
(Ⅱ)由面积公式得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055825-94663.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055825-46980.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055826-81107.gif)
由余弦定理得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055826-19197.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055826-67085.gif)
解析
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055816-80771.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055816-83471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055817-17716.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055817-26073.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055817-36162.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055817-38903.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055817-82761.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055818-54338.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055818-61224.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055818-74090.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055818-63451.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055819-94799.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055819-24812.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055819-13493.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055819-59287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055819-82411.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055813-88389.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055813-70179.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055813-38689.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055807-50082.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055807-19825.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055808-93237.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055803-97764.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055803-51376.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055803-60376.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055804-19350.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055804-52936.gif)
求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055803-97764.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055754-57608.gif)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055754-96741.gif)
(2)若BC=
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055754-89449.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055754-59834.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055754-17437.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055755-30554.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055755-34519.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020055754-17437.gif)
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