题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063341-92506.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063341-74626.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063341-61886.gif)
(2)若b=3,求a+c的最大值。
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063341-88121.gif)
(2)a+c的最大值为6。
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063341-51664.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063342-88553.gif)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063342-33630.gif)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063341-92506.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063341-88121.gif)
(2)由(1)知
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063342-96122.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063342-98877.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063343-17636.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063338-27058.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063338-27058.gif)
则角A的大小为______________.
在
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063332-77774.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063332-33690.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063332-50630.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063333-22414.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063333-60144.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063333-31358.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063333-70410.jpg)
(Ⅰ) 求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063333-94567.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063333-99486.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063333-70410.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063332-77774.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063326-98717.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063326-52330.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063326-22633.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063326-26118.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063326-36187.gif)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063326-98717.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063327-54514.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063327-73057.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063327-90953.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063326-98717.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063320-85322.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063320-23000.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063320-66483.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063321-25326.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063321-82859.gif)
A.![]() ![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063316-20763.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020063316-73149.gif)
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