题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065214-37179.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065214-10404.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065214-15699.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065214-14760.gif)
(I)求边
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065214-33165.gif)
(II)若2S=
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065215-32596.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065215-99624.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065215-99624.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065215-82778.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065215-75822.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065215-24554.gif)
根据正弦定理,
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065216-63954.gif)
两式相减,得
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065215-82778.gif)
(II)依题意,得absinC=a
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065215-99624.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065216-69630.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065215-99624.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065215-99624.gif)
由余弦定理知:a
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065215-99624.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065215-99624.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065215-99624.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065216-39188.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065216-32467.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065217-42805.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065217-42805.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065215-99624.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065217-42805.gif)
又0
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065217-36442.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065217-36442.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065216-39188.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065217-42805.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065217-61287.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065216-39188.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065217-42805.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065217-42805.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065217-82992.gif)
即tan
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065217-42805.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065216-39188.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065217-15308.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065218-18233.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065215-75822.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065209-60908.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065210-73882.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065210-93605.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065210-80906.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065210-48732.gif)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065210-77408.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065206-71706.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065201-96546.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065201-56915.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065202-87906.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065156-67536.gif)
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065156-46222.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065146-70023.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065147-15849.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065147-65094.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065147-65474.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065147-93400.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065148-74316.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065148-87534.gif)
已知
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065148-12783.gif)
(Ⅰ)求角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065147-93400.gif)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065148-84306.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065148-74316.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065148-22208.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065149-99874.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020065149-80650.gif)
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