题目
题型:解答题难度:简单来源:不详
已知函数
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111129-49262.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111129-44367.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111129-68725.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111129-32159.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111130-51977.png)
解析
试题分析:解:∵
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111130-79176.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111130-49429.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111130-31328.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111131-15818.png)
由于
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111130-31328.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111131-89534.png)
∴在
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111131-15818.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111131-89534.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111131-14628.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111131-60254.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111132-31473.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111131-14628.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111132-28267.png)
又∵
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111132-38287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111132-50457.png)
即:
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111133-26513.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111133-99705.png)
所以有:
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111133-91338.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111134-73525.png)
∴实数
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111134-93079.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111130-51977.png)
点评:求解本题结合二次函数
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111134-58064.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111134-26279.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111135-41966.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111135-12274.png)
核心考点
试题【 (本题满分13分)已知函数,若对一切恒成立.求实数 的取值范围. 】;主要考察你对正弦函数的图象与性质等知识点的理解。[详细]
举一反三
已知向量
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111026-50891.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111026-58863.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111026-95059.png)
(Ⅰ)若函数
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111026-52013.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111027-38461.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111026-52013.png)
(Ⅱ)若函数
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111026-52013.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111027-51667.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111027-60497.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111026-52013.png)
已知函数
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111017-18017.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111018-59458.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111018-26247.png)
(I) 函数
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111018-57367.png)
(Ⅱ)在△ABC中.a、b、c分别是角A、B、C的对边,
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111018-67087.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111019-69059.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910111019-80438.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910110939-30863.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910110914-18117.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910110846-39881.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910110846-38883.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910110846-74902.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910110846-59400.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190910/20190910110847-22440.png)
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