题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035457-70855.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035458-78300.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035458-22506.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035458-52286.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035458-88065.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035459-23488.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035459-39905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035459-70964.png)
解此三角形.
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035459-36684.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035500-30967.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035500-37840.png)
解析
试题分析:由正弦定理得:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035500-52058.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035500-94987.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035500-12783.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035501-89053.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035501-62392.png)
同理,当
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035501-71608.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035501-98246.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035459-36684.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035500-30967.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035500-37840.png)
点评:正弦定理
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035502-75022.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035502-28464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035502-85287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035502-51306.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035454-24394.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035454-21277.png)
A.直角三角形 | B.锐角三角形 |
C.等腰三角形 | D.等边三角形 |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035447-66366.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035447-65370.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035448-82757.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035448-20567.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035448-71878.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035448-61871.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035449-59024.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035449-85647.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035443-55336.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035443-74341.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035444-14025.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035444-84364.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035444-72203.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035435-58321.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035435-85523.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035435-58321.png)
A.钝角三角形 | B.直角三角形 |
C.锐角三角形 | D.不能确定 |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035429-51559.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035430-71130.png)
(1)求角B;
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035430-18169.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035430-20119.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020035430-43628.png)
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