题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035535-17852.png)
A.(2,-3) | B.(-2,3) | C.(2,3) | D.(-2,-3) |
答案
解析
试题分析:已知解析式为顶点式,可直接根据顶点式的坐标特点,求顶点坐标,从而得出对称轴.
y=(x+2)2 +3是抛物线的顶点式,根据顶点式的坐标特点可知,顶点坐标为(2,3).
故答案为:C.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035529-33365.png)
A.(2,4) | B.(-2,-4) | C.(-4,2) | D.(4,-2) |
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035522-94322.png)
A.abc>0 | B.3a +c<0 | C.4a+2b+c<0 | D.b2 -4ac<0 |
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035510-92475.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035511-17306.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035511-65407.png)
(1)求直线AB和这个抛物线的解析式;
(2)设抛物线的顶点为D,求△ABD的面积
(3)作垂直x轴的直线x=t,在第一象限交直线AB于M,交这个抛物线于N.求当t 取何值时,MN的长度l有最大值?最大值是多少?
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035459-93789.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035459-74300.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035459-31392.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035459-93789.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035459-31392.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035459-45658.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035459-61525.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035459-94308.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035500-27292.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035500-74424.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035459-93789.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035500-85449.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035459-45658.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035500-74424.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035459-93789.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035500-38783.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035500-46859.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035500-19966.png)
(1)在整个运动过程中,设等边
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035459-93789.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035459-31392.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035500-66202.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035500-66202.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035500-38783.png)
(2)如图②,当点
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035500-70950.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035501-13124.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035501-43187.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035501-11775.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035501-27370.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035501-75411.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035501-79201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035500-70950.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035502-92911.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035502-75066.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035502-82481.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035502-58725.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035502-22520.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035502-20686.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035502-52262.png)
(3)如图③,若四边形
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035459-31392.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035459-74300.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035459-93789.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035502-25560.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035459-93789.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035503-78027.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035500-74424.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035503-75207.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035503-50452.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035459-93789.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035503-78027.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035503-71816.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035503-49507.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035503-71845.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035503-17475.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035500-38783.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019035452-17990.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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