题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075626-58906.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075626-45972.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
答案
解析
解答:解:y=x2-6x+11,
=x2-6x+9+2,
=(x-3)2+2.
故选D.
点评:二次函数的解析式有三种形式:(1)一般式:y=ax2+bx+c(a≠0,a、b、c为常数);
(2)顶点式:y=a(x-h)2+k;(3)交点式(与x轴):y=a(x-x1)(x-x2).
核心考点
举一反三
②abc>0;③a-b+c>0;④2a-3b=0;⑤c-4b>0.你认为其中正确的信息是( )
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075621-30749.png)
A.①②③⑤ | B.①②③④ |
C.①③④⑤ | D.②③④⑤ |
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075618-32922.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075604-34764.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075605-54748.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075605-62215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075605-62774.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075605-39897.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075605-69582.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075606-49672.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075606-71894.png)
小题1:(1)求这个二次函数的解析式;
小题2:(2)将
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075606-40479.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075605-62215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075606-38354.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075605-39897.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075606-69483.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075605-62774.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075606-69483.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075606-69483.png)
小题3:(3)设(2)中平移后所得二次函数图象与
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075605-62774.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075607-97461.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075607-40782.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075607-70291.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075607-93618.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075607-50512.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075608-53652.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075607-70291.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075558-31729.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075553-11981.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075554-23202.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075554-13809.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075554-42671.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191019/20191019075554-13809.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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