题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011402-41725.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011402-18251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011402-41725.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011402-22784.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011402-18861.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011402-28101.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011402-69096.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011403-62586.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011403-86595.png)
A.![]() | B.![]() ![]() | C.![]() | D.![]() |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011402-22784.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011402-18861.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011402-28101.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011402-69096.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011403-62586.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011404-80906.png)
以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011404-93929.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011405-22721.png)
由余弦定理可知
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011405-24035.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011405-21866.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011405-11757.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011405-11757.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011405-89604.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011406-56889.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011406-16416.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011406-96595.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011353-27193.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011353-40058.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011353-96184.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011354-88840.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011354-97430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011354-88485.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011354-24605.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011354-51914.png)
(Ⅰ)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011354-88485.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011355-66694.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011355-78367.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011355-55313.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011355-78203.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011346-36808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011346-39641.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011347-75688.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011347-85435.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011347-99619.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011347-74305.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011348-98601.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011340-19799.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011340-53706.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011340-80495.png)
且
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011341-66030.png)
(1)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011341-10777.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011341-92528.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011340-19799.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011336-74007.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011336-22017.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011329-66983.png)
A、
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011329-19316.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011329-30499.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011330-85528.png)
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