题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032809-77180.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032809-77148.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032809-14904.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032809-48931.png)
(Ⅰ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032810-66698.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032810-36969.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032809-77180.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032810-47187.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032810-71503.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032809-77180.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032810-17544.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032811-60783.png)
解析
试题分析:(Ⅰ)先利用余弦定理求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032811-78854.png)
(Ⅱ)由三角形内角和定理及已知条件
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032811-71382.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032811-72616.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032811-65419.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032812-63430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032812-56951.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032812-63459.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032812-56951.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032812-29214.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032810-47187.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032812-94983.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032813-90572.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032813-75272.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032812-63459.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032813-17795.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032810-47187.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032813-24246.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032814-32306.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032814-84374.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032814-96035.png)
试题解析:(Ⅰ)由已知及余弦定理得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032814-62683.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032814-21244.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032815-73234.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032815-22058.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032815-89783.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032815-50415.png)
(Ⅱ)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032816-89206.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032816-94687.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032811-65419.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032816-89347.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032812-56951.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032812-29214.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032810-47187.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032812-94983.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032813-90572.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032813-75272.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032812-63459.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032813-17795.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032810-47187.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032816-55905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032814-32306.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032814-84374.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032814-96035.png)
综上知
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032811-60783.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032803-83221.png)
(1)求角A;(2)若a=2,求c.
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032757-46496.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032757-89320.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032757-11963.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032757-64223.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032757-54632.png)
(Ⅱ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032758-73362.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032747-23285.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032748-31486.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032748-14807.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032748-14104.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032748-12260.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032748-23958.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032749-96041.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032749-34511.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032749-51620.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032749-86552.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032740-80575.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032740-23595.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032740-17350.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032740-63837.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032741-21833.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032741-86564.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032741-92048.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032741-84335.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032740-80575.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032742-98040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032742-65783.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032742-48032.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032742-37112.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032730-94796.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032730-70251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032730-87873.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032730-90570.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032730-25877.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032731-62555.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032731-83588.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032731-16907.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032731-66454.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032732-29669.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032732-98775.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032732-88945.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020032732-30566.png)
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