题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034743-29146.png)
(1)试判定ΔABC的形状,并求sinA+sinB的取值范围。
(2)若不等式
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034744-13898.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034744-77361.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034744-87583.png)
解析
试题分析:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034743-29146.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034744-46452.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034744-83940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034745-54583.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034745-44516.png)
(2)在
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034745-15000.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034745-60038.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034746-67935.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034746-32565.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034746-63641.png)
右边
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034746-81833.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034747-13515.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034747-54690.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034747-72722.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034746-67935.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034747-76667.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034747-36090.png)
故
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034748-95874.png)
点评:第二问不等式恒成立中求参数范围的题目常采用分离参数法首先将
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034748-19325.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034748-95930.png)
核心考点
试题【已知ΔABC中,满足,a,b,c分别是ΔABC的三边。(1)试判定ΔABC的形状,并求sinA+sinB的取值范围。(2)若不等式对任意的a,b,c都成立,求实】;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/20191020/20191020034733-91813.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034734-48643.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034733-91813.png)
A.锐角三角形 | B.直角三角形 | C.钝角三角形 | D.不能确定 |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034727-51734.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034727-20075.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034727-25105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034728-65027.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034728-42426.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034727-20075.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034727-25105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034728-65027.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034728-78087.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034721-31876.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034721-37173.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034721-42252.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034713-50165.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034713-88370.png)
(1)求A;
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034713-17619.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020034713-50165.png)
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