题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163445-90649.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163445-10441.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163445-24176.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163446-63240.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163446-63240.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163446-63240.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163446-43180.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163446-50975.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163446-81744.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163446-16606.png)
(Ⅱ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163447-73786.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163447-98011.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163447-81885.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163447-14666.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163448-22424.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163448-16516.png)
(Ⅱ)因
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163448-72622.png)
而
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163448-27618.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163448-36882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163449-29233.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163449-79977.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163449-19727.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163450-40704.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163450-14107.png)
故
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163450-48538.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163450-79356.png)
解析
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163413-26547.png)
(1)求角B的大小;
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163414-57245.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163414-89902.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163414-24939.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163310-75127.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163310-75127.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163310-63530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163310-33039.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163310-68449.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163310-75127.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163312-36357.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163258-77256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163258-81110.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163245-87894.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163245-18369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163246-27649.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163246-12056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163246-85489.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163222-40921.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163222-92210.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163222-78239.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163222-72436.png)
A.
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163223-19290.png)
B.
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163223-66763.png)
C.
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163223-37760.png)
D.
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019163223-23713.png)
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