题目
题型:不详难度:来源:
在△
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060452-35597.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060452-53730.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060452-64819.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060452-84528.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060453-39124.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060453-61706.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060453-96926.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060453-21509.gif)
⑴求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060454-55770.gif)
⑵若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060454-28694.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060454-99565.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060454-16609.gif)
答案
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060454-12106.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060455-56294.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060455-64224.gif)
解析
解:⑴∵
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060453-21509.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060455-72161.gif)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060452-84528.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060455-52839.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060456-89472.gif)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060456-90623.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060456-29795.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060456-10529.gif)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060456-18596.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060457-90924.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060457-83072.gif)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060457-42677.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060454-12106.gif)
⑵∵
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060454-12106.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060457-50083.gif)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060456-18596.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060458-75578.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060458-22674.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060458-37577.gif)
解得,
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060455-56294.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020060455-64224.gif)
核心考点
举一反三
![](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)
![](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)
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