题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060834-39976.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060835-20232.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060835-89118.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060835-79723.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060836-52405.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060836-59109.png)
∴这个二次函数图象开口向下,
∴当
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060836-66619.png)
故选B.
核心考点
试题【烟花厂为扬州烟花三月经贸旅游节特别设计制作一种新型礼炮,这种礼炮的升空高度与飞行时间的关系式是,若这种礼炮在点火升空到最高点处引爆,则从点火升空到引爆需要的时间】;主要考察你对二次函数定义等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060828-58615.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060828-41227.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060828-66957.png)
(1)在点
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060829-53146.png)
(2)设点
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060829-53146.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060828-66957.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060829-77958.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060823-74656.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060823-70575.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060823-53981.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060818-47645.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060818-46266.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060818-76383.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060819-43890.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060801-78658.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060801-52510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060801-85194.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060801-80318.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060801-51029.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060802-32638.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060802-33414.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060808-18163.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060808-16272.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060808-54703.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060808-57659.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060808-54703.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060801-85194.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060808-54703.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060808-18163.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060808-72930.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060808-98272.png)
(2)设线段
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060808-68846.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060808-17472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060808-54703.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060808-18163.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060808-17472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060808-18163.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060808-18163.png)
(3)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060809-64508.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060808-57659.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060808-57659.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060808-54703.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060809-88023.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060809-93977.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060808-54703.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060809-98799.png)
x | … | -2 | -1 | 0 | 1 | 2 | … |
y | … | 0 | 4 | 6 | 6 | 4 | … |
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019060757-94185.png)
A.1个 B.2个 C.3个 D.4个
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