题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060444-59406.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060444-67743.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060444-21696.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060445-65710.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060445-21691.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060445-72358.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060445-17271.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060446-15382.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060446-95032.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060446-97916.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060446-52151.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060445-21691.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060445-17271.gif)
答案
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060446-67880.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060447-42278.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060446-15382.gif)
得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060447-43679.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060447-37890.gif)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060444-67743.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060444-21696.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060445-65710.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060444-59406.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060447-59161.gif)
因此
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060446-67880.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060447-93908.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060448-68957.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060448-46950.gif)
由余弦定理得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060448-22042.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060448-41434.gif)
解方程组
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060449-33989.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060447-42278.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060438-72915.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060438-23184.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060439-13675.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060439-83033.gif)
(Ⅰ)求角C的大小;
(Ⅱ)求a+b的值.
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060431-83261.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060431-74244.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060432-94011.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060432-63689.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060429-79706.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060429-65568.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060429-31679.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060420-58754.gif)
野营活动中,学生在平地上用三根斜杆搭建一个正三棱锥形的三脚支架
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060420-18742.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060420-28731.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060420-43231.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060421-23952.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060421-71599.gif)
(1)求斜杆
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060421-13436.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060421-48160.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060421-97145.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060422-87874.gif)
(2)将炊事锅看作一个点
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060422-96613.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060422-91265.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060422-96613.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060421-48160.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060422-36377.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060422-91265.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060416-56688.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060416-80346.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060416-24497.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060417-28542.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060416-56688.gif)
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