题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011311-37715.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011311-53463.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011312-89949.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011312-17794.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011312-46326.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011312-75298.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011312-51465.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011312-66785.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011312-77135.png)
(Ⅰ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011312-19850.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011312-56312.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011312-53725.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011311-37715.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011313-68493.png)
整理得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011313-18582.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011313-67101.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011313-68904.png)
故
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011313-24095.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011314-18535.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011314-35406.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011314-12154.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011314-84497.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011314-43129.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011315-27937.png)
解得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011315-89036.png)
(Ⅱ)因为
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011315-75569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011315-45022.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011315-14658.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011316-16991.png)
由此得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011316-31276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011311-37715.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011316-66208.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011316-76478.png)
其面积
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011317-58991.png)
解析
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011305-38942.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011259-66877.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011259-27675.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011253-40346.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011254-62654.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011254-53337.png)
A.锐角 | B.钝角 | C.直角 | D.不能确定 |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011242-84638.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011242-66599.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011242-31746.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020011243-51815.png)
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