题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040127-22631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040127-56050.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040127-25419.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040128-79582.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040128-64166.jpg)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040128-35539.png)
解析
试题分析:由题意可知在
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040128-92070.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040128-59565.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040129-75709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040129-48186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040128-35539.png)
点评:解三角形的应用题首先将已知条件抽象成解三角形问题,再结合正余弦定理求解
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040120-35148.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040120-86228.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040120-69574.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040120-75038.png)
(Ⅰ) 若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040120-64065.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040120-20584.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040120-87474.png)
求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040120-63948.png)
(Ⅱ) 若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040120-35148.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040120-32639.png)
求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040120-26135.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040108-59203.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040108-60969.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040108-72633.png)
已知:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040108-99057.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040109-53135.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040109-56049.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040109-53972.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040109-32341.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040102-99502.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040103-62765.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040103-11087.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040059-83104.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040059-55556.png)
A.等边三角形 | B.等腰三角形 | C.不等边三角形 | D.直角三角形 |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040054-52432.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040054-10037.png)
(1)求角A的大小;
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040054-52432.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040054-32556.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020040055-36326.png)
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