题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011013-11418.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011013-81159.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011013-55471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011014-37014.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011013-81159.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011014-59753.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011014-69529.jpg)
答案
解析
解:设在时刻
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011014-73154.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011015-84059.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011014-73154.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011015-94684.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011015-88161.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011015-61576.png)
故
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011015-17681.png)
因此
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011016-99464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011016-75676.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011016-93872.png)
答:12小时后该城市开始受到台风的侵袭。
核心考点
试题【在某海滨城市附近海面上有一台风,据监测,当前台风中心位于城市O的东偏南方向300的海面P处,并以的速度向西偏北方向移动。台风侵袭的范围为圆形区域,当前半径为60】;主要考察你对余弦定理等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020010959-73405.png)
A、
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020010959-95247.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020010959-94544.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020010959-53227.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011000-85870.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020010954-95563.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020010954-45048.png)
(a+b,c),
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020010954-27602.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020010955-76166.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020010955-10083.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020010950-10109.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020010950-33534.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020010946-82648.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020010947-26621.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020010947-99849.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020010941-50515.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020010941-62604.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020010941-97118.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020010941-22575.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020010942-24485.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020010942-44819.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020010941-50515.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020010942-36763.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020010942-40740.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020010942-91716.png)
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