题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075001-48025.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075002-13976.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075002-63775.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075002-18361.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075002-23165.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075003-50456.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075003-73425.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075003-61789.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075003-24440.gif)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075004-49582.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075004-43748.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075004-18251.gif)
(II)由(I)知
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075004-96499.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075005-87923.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075005-48678.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075005-95772.gif)
由余弦定理得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075005-55332.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075006-45210.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020075006-85825.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074953-45410.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074953-86030.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074953-78248.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074953-19868.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074942-95883.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074942-50527.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074942-19766.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074942-26105.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074942-94908.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074943-78629.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074943-20874.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074943-91473.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074942-50527.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074942-19766.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074942-95883.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074943-78530.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074928-72340.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074928-13803.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074928-17504.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074929-85371.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074929-94556.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074929-69690.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074930-59447.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074930-89854.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074930-58229.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074930-65045.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074928-72340.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074931-22307.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074931-69869.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074931-25590.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074931-26516.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074928-72340.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074922-75723.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074922-19342.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074922-38389.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074922-75723.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074922-19342.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074922-84318.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074923-75416.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074922-19342.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074923-88021.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074923-75416.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074922-19342.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074923-89882.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074923-10088.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074914-35545.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074915-19773.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074915-38384.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074915-30438.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074915-15392.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020074916-70292.gif)
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