题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001339-47694.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001339-37238.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001340-42540.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001340-78647.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001340-38962.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001340-65375.png)
解析
试题分析:由余弦定理得:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001341-90598.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001339-37238.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001340-42540.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001340-78647.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001341-99848.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001341-13556.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001333-50763.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001333-36537.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001334-21080.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001334-15708.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001334-42464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001334-23102.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001335-79203.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001335-13462.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001335-11584.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001335-96528.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001333-50763.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001326-37257.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001326-75492.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001326-45676.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001326-41479.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001327-73815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001327-72765.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001327-38119.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001327-60825.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001310-58426.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001310-46017.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001311-30702.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001311-72658.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001311-35066.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001302-16567.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001302-79995.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001302-83581.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001303-26401.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001303-49040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001303-58162.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001303-52813.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001303-49040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001303-58162.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001303-52813.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001304-61559.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001304-42738.png)
(2)求角B的最大值,并判断此时
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001302-16567.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001255-91269.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001255-19455.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001256-46344.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001256-42046.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020001256-10311.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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