题目
题型:解答题难度:一般来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040627-75031.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040627-46019.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040627-17592.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040627-61046.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040628-73312.png)
(Ⅰ)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040628-60384.png)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040628-80146.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040628-54581.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040628-33980.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040629-84688.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040629-22472.png)
(Ⅲ)若
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040629-86638.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040629-21632.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040629-98088.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040630-65426.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040630-83571.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040629-21632.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040630-58100.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040630-75779.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040630-31932.png)
解析
试题分析:(Ⅰ)属于三个二次之间的关系,由一元二次不等式
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040631-12168.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040628-73312.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040631-82060.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040631-92249.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040628-33980.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040631-31158.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040631-95986.png)
试题解析:(Ⅰ)0,2是方程
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040632-45804.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040632-18268.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040631-82060.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040632-79397.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040630-58100.png)
(Ⅱ)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040632-65787.png)
分以下情况讨论
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040632-60455.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040631-31158.png)
(1).当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040633-55626.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040633-86487.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040633-35487.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040633-91645.png)
(2).当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040633-94080.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040634-86533.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040634-64958.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040634-54464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040634-66679.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040635-19539.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040635-78445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040635-51368.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040635-32012.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040635-65084.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040635-63000.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040636-30100.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040636-30511.png)
综上所得
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040630-75779.png)
(Ⅲ)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040630-75779.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040636-46571.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040636-78201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040636-96291.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040637-68504.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040637-80369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040637-78351.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040637-60754.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040638-11528.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040638-74337.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040630-31932.png)
核心考点
试题【已知二次函数的最小值为,且关于的一元二次不等式的解集为。(Ⅰ)求函数的解析式;(Ⅱ)设其中,求函数在时的最大值;(Ⅲ)若(为实数),对任意,总存在使得成立,求实】;主要考察你对函数的单调性与最值等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040622-10183.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040623-93256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040623-14996.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040623-51354.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040623-93256.png)
①
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040623-33409.png)
②
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040623-94754.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040623-93256.png)
③函数
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040623-93256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040623-92167.png)
④若关于
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040624-22141.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040624-74233.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040624-85200.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040624-77766.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040624-76138.png)
以上命题中所有正确的命题的序号为_______________.
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040620-41065.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040617-73084.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040617-22743.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040617-75298.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040614-32033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040614-36328.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040614-89640.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040614-32033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040614-20657.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818040611-71627.png)
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