题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045450-39978.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045450-22700.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045450-66177.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045450-71530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045450-39978.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045450-18193.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045451-97089.png)
(1).求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045451-68767.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045450-71530.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045451-45467.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045451-55961.png)
当且仅当
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045452-65422.png)
(1)由
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045452-13244.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045452-96444.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045452-93668.png)
故,
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045451-45467.png)
(2)由
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045451-45467.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045452-28330.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045453-86196.png)
当且仅当
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045452-65422.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045452-13244.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045452-96444.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045452-93668.png)
进而整理出
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045451-45467.png)
(2)在(1)的基础上,可求得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045452-28330.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045453-44376.png)
解:(1)由
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045452-13244.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045453-97467.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045452-93668.png)
故,
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045451-45467.png)
(2)由
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045451-45467.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045452-28330.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045453-53323.png)
当且仅当
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045452-65422.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045441-20724.png)
(I)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045442-10041.png)
(II)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045442-39730.png)
已知
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045432-13645.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045432-45179.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045433-80235.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045433-68519.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045433-29237.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045433-24886.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045434-51201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045434-24584.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045434-73719.png)
(1)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045433-68519.png)
(2)若向量
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045434-83852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045434-24704.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045433-29237.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045433-24886.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045427-18454.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045427-96066.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045427-60940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045427-75026.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045428-97223.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045428-89897.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045428-73352.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045428-67694.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045423-12889.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045423-85852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045423-28852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045424-39492.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045424-82044.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045416-95033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045416-38703.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045417-62944.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045417-55159.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045417-44706.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045417-83384.png)
求 (1) 内角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045418-57254.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045418-78835.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045416-95033.png)
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