题目
题型:解答题难度:简单来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144223-32633.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144224-80914.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144224-94160.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144224-71918.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144225-77226.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144225-61580.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144225-96201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144225-13684.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144226-68304.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144226-52063.png)
解析
试题分析:(Ⅰ)用正弦定理及两角和与差的公式将
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144224-71918.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144226-82052.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144226-59061.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144226-16012.png)
试题解析:(Ⅰ)由
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144227-98292.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144227-16602.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144227-18010.png)
(2分)
即
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144227-81537.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144228-29080.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144228-28026.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144228-68594.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144228-72608.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144228-86712.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144228-13979.png)
解得
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144229-47692.png)
(Ⅱ)由(Ⅰ)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144229-33138.png)
得
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144229-77512.png)
∴△ABC的面积
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144229-73293.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144229-81028.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144230-15424.png)
核心考点
试题【在△ABC中,角的对边分别为,已知,.(Ⅰ)求和;(Ⅱ)若,求的面积.】;主要考察你对任意角三角函数的概念等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144149-23787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144150-94394.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144150-56497.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144139-25484.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144139-57666.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144139-64890.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144140-45334.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144140-60083.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144140-91080.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144140-60391.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144130-94137.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144130-51569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144130-14105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144130-60504.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144130-93913.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144130-51569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144131-46227.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144131-11324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144131-18279.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144131-67108.png)
(Ⅰ)若
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144131-50612.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144132-62343.png)
(Ⅱ)分别过
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144132-81437.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144130-14105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144132-81666.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144132-58258.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144132-87222.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144132-20683.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144133-78905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144133-81636.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144130-51569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144113-58269.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144113-38577.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144114-16783.png)
(Ⅰ)当
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144114-89654.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144114-44551.png)
(Ⅱ)求矩形
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144114-16783.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144114-98926.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144018-65188.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144018-85986.png)
(Ⅰ)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144018-71904.png)
(Ⅱ)当
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144018-93921.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190822/20190822144018-71904.png)
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