题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071650-86057.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071650-29301.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071650-29634.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071650-14057.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071650-86057.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071651-12265.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071651-58717.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071651-54073.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071651-40058.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071651-55972.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071652-45692.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071651-40058.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071652-23793.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071652-21376.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071652-59815.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071652-45692.gif)
核心考点
举一反三
△ABC中,角A、B、C的对边依次为
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071638-44745.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071638-24525.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071638-74548.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071638-40720.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071639-40522.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071639-65882.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071638-74548.gif)
(1)求∠A的大小(用反三角函数表示);
(2)求边长
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071638-74548.gif)
(3)在AB、AC上分别有点D、E,线段DE将△ABC分成面积相等的两部分,求线段DE长的最小值.
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071633-14264.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071633-43979.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071633-17874.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071634-87233.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071633-14264.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071633-14264.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071634-76764.gif)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071620-10791.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071620-18740.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071620-68151.gif)
①若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071620-99297.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071620-94461.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071621-64230.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071621-59609.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071621-30716.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071620-10791.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071621-87986.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071622-24494.gif)
A.1个 | B.2个 | C.3个 | D.4个 |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071613-47858.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071613-57676.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071613-73893.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071613-73893.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071614-87123.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071613-47858.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071614-97193.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020071614-41443.gif)
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