题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042241-89558.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042242-89791.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042242-75839.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042242-10982.png)
(Ⅰ)求角B的大小;
(Ⅱ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042242-54826.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042243-33835.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042243-96072.png)
解析
试题分析:解:(Ⅰ)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042243-59130.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042243-25006.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042242-75839.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042243-11873.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042244-95540.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042243-11873.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042244-64805.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042243-11873.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042244-95121.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042243-59130.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042244-97017.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042243-11873.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042245-65143.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042243-11873.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042245-11794.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042243-11873.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042243-33835.png)
(Ⅱ)由(Ⅰ)知,
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042245-36306.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042243-11873.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042242-75839.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042243-11873.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042245-90007.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042245-26028.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042246-76631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042246-37049.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042243-59130.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042246-45625.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042246-54508.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042243-11873.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042247-60220.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042243-11873.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042246-37049.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042247-99467.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042243-11873.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042245-90007.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042247-99467.png)
点评:结合向量的知识解决解三角形是解决试题的关键,试题比较常规,只要能注意到角的范围,一般不会有问题。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042237-44693.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042237-36181.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042237-71336.png)
A.等腰直角三角形 | B.等腰或直角三角形 |
C.等腰三角形 | D.直角三角形 |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042227-93047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042227-91617.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042228-44530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042228-61814.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042227-91617.png)
(1) 求角A的大小;
(2) 若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042228-34960.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042228-60344.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042228-82306.png)
如图,在△ABC中,
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042219-46959.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042219-15191.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042220-47607.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042220-14284.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042220-51631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042220-27630.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042220-80149.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042210-18348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042210-64824.png)
(Ⅰ)求角C的大小:
(Ⅱ)设角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042210-68938.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042210-17300.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042210-50111.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042211-72911.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042211-33889.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042205-91781.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042205-51559.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042205-67759.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042205-28131.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042206-28915.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042206-30635.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042206-14644.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042206-16248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042206-53781.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020042207-81104.png)
A.8 | B.16 | C.32. | D.64 |
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