题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045501-23354.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045501-89758.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045501-40574.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045502-26999.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045502-34937.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045502-20810.png)
(1)求∠
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045501-89758.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045502-85518.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045503-54174.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045503-35696.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045503-36720.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045503-68758.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045504-99415.png)
(2) 由条件可得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045504-20572.png)
将
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045504-83463.png)
解得 b=1,c=2 或 b=2,c=1 .
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045456-45130.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045457-66447.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045457-81777.png)
A.直角三角形 | B.等腰三角形 | C.等腰直角三角形 | D.无法确定 |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045450-39978.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045450-22700.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045450-66177.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045450-71530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045450-39978.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045450-18193.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045451-97089.png)
(1).求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045451-68767.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045450-71530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045441-20724.png)
(I)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045442-10041.png)
(II)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045442-39730.png)
已知
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045432-13645.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045432-45179.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045433-80235.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045433-68519.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045433-29237.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045433-24886.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045434-51201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045434-24584.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045434-73719.png)
(1)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045433-68519.png)
(2)若向量
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045434-83852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045434-24704.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045433-29237.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045433-24886.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045427-18454.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045427-96066.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045427-60940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045427-75026.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045428-97223.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045428-89897.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045428-73352.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045428-67694.jpg)
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