题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044240-43487.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044241-54449.png)
(1)求角A的大小
(2)现给出三个条件:①
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044241-18274.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044241-59885.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044241-16501.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044241-62313.png)
(2)方案一:选择①②,
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044241-29755.png)
方案二:选择①③,
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044241-54796.png)
若选择②③由c=
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044241-10232.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044242-38286.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044241-54449.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044242-64521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044242-34152.png)
从而可得到
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044241-62313.png)
(2)从正弦定理可解三角形或余弦定理可解三角形的类型上分析可以有两种方案.
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044242-64521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044242-34152.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044242-74701.png)
(2)方案一:选择①②,由正弦定理
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044242-95022.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044242-76192.png)
又∵A+B+C=
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044243-23289.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044243-80209.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044241-29755.png)
方案二:选择①③由余弦定理
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044243-69510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044243-81797.png)
b=2 c=
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044243-66164.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044241-54796.png)
说明:若选择②③由c=
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044241-10232.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044242-38286.png)
核心考点
试题【(10分)在△ABC中,分别为内角A.B.C所对的边,且满足(1)求角A的大小(2)现给出三个条件:①②③试从中选出两个可以确定△ABC的条件写出你的选择,并以】;主要考察你对解三角形应用等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044234-68484.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044234-54897.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044234-19054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044235-55810.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044235-70276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044235-41114.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044235-52155.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044236-10456.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044236-14690.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044236-90980.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044236-66357.png)
已知函数
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044226-69769.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044227-51087.png)
(Ⅰ)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044227-53579.png)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044227-48140.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044227-64561.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044227-95287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044228-52633.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044228-17655.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044228-44738.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044228-32357.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044221-59079.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044222-34702.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044222-66999.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044222-50993.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044222-11684.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044223-80927.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044223-82289.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044215-35163.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044215-52095.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044215-95178.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044215-80928.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044216-69035.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044216-30661.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044216-84540.png)
在
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044159-58161.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044200-90440.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044200-62318.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044200-61297.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044200-17912.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044201-50995.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044201-89464.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044201-80288.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044200-90440.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044201-23502.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044159-58161.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044201-33609.png)
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