题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082651-36969.png)
答案
解析
试题考查知识点:二次函数图像的增减性
思路分析:二次函数图像的增减性以对称轴为拐点
具体解答过程:
根据二次函数对称轴的计算方法,可知对称轴为x=-
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082651-63714.png)
∵二次项系数a=2>0
∴函数图象开口向上
∴函数图象在直线x=-3的左侧是函数值y随x的增大而减小(减函数);在直线x=-3的右侧是函数值y随x的增大而增大(增函数)
∴当x<-3时,二次函数
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082651-36969.png)
试题点评:
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082646-82595.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082646-71589.png)
小题1:喷出的水流距水平面的最大高度是多少?
小题2:
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082646-74450.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082630-31228.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082631-16273.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082631-63767.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082631-92879.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082631-14994.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082632-45782.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082632-94432.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082632-95518.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082632-61927.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082633-24446.png)
小题1:用含
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082633-23364.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082632-94432.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082633-11163.png)
小题2:连结
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082633-12097.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082633-12097.png)
小题3:点
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082633-14012.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082633-14012.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082633-14012.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082633-12097.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082632-94432.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082633-14012.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082626-43662.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082626-59305.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082626-68231.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082626-36855.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082626-68231.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082626-36855.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082627-79099.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082627-97833.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082627-28396.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082627-31577.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082628-61527.png)
A.1个 | B.2个 | C.3个 | D.4个 |
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082621-94156.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082621-53281.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082621-92007.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082616-82606.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019082616-90631.png)
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