题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042122-33833.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042122-55811.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042122-56501.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042123-85732.png)
解析
试题分析:解:由
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042123-10581.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042123-66296.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042123-47374.png)
a+c=8,ac=15,所以a=5,c=3,或a=3,c=5,所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042124-69913.png)
点评:考查了三角形内角和定理,以及余弦定理的运用,属于基础题。
核心考点
举一反三
已知
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042113-73305.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042113-75278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042114-49295.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042114-37598.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042114-92399.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042114-74441.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042114-22224.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042115-12259.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042115-39903.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042115-44324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042115-58502.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042115-30722.png)
△
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042107-78114.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042107-17142.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042107-86697.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042107-44250.png)
如图,飞机的航线和山顶在同一个铅直平面内,已知飞机的高度为海拔25000米,速度为3000米/分钟,飞行员先在点A看到山顶C的俯角为300,经过8分钟后到达点B,此时看到山顶C的俯角为600,则山顶的海拔高度为多少米.(参考数据:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042102-34396.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042102-94238.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042103-87079.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042103-80677.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042058-96077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042058-86954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042059-48117.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042054-56978.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042054-45710.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042054-51181.jpg)
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