题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050339-44340.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050339-13768.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050339-10096.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050340-63118.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050340-41268.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050340-31530.png)
答案
设缉私船用t h在D处追上走私船,则有CD=10
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050340-88215.png)
∵AB=
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050340-88215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050341-93768.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050341-93768.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050341-93768.png)
=(
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050340-88215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050341-93768.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050341-93768.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050340-88215.png)
∴BC=
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050341-63182.png)
sin∠BCD=
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050341-23125.png)
即缉私船北偏东60°方向能最快追上走私船.
解析
核心考点
试题【在海岸A处,发现北偏东方向,距离A为海里的B处有一走私船,在A北偏西方向距离A为2海里的C处有我方一艘缉私艇奉命以海里/小时的速度追截走私船,且C在B的正西方,】;主要考察你对解三角形应用等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050334-81484.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050334-25974.jpg)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050330-44993.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050330-93241.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050330-50672.jpg)
(I)求角C的大小;
(II)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050331-83981.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050331-55539.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050325-70626.png)
(Ⅰ)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050325-98509.png)
(Ⅱ)设AB=3,求AB边上的高
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050322-11215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050322-17020.png)
(Ⅰ)求角C;
(Ⅱ)若△ABC的最短边长是
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050322-64467.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050316-45183.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050316-64976.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050316-73836.png)
求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020050317-32387.png)
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