满分5 >
初中数学试题 >
请写出一个开口向下,且函数有最大值2的二次函数的解析式是 .
请写出一个开口向下,且函数有最大值2的二次函数的解析式是 .
考点分析:
相关试题推荐
若二次函数y=ax
2的图象经过点(-1,2),则二次函数y=ax
2的解析式是 ______.
查看答案
二次函数y=(x-2)
2+1的图象的对称轴为
.
查看答案
在同一平面直角坐标系中,一次函数y=ax+b和二次函数y=ax
2+bx的图象可能为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001104128974082/SYS201311030011041289740009_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001104128974082/SYS201311030011041289740009_ST/images1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001104128974082/SYS201311030011041289740009_ST/images2.png)
D.
查看答案
如图,已知:正方形ABCD边长为1,E、F、G、H分别为各边上的点,且AE=BF=CG=DH,设小正方形EFGH的面积为s,AE为x,则s关于x的函数图象大致是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001104128974082/SYS201311030011041289740008_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001104128974082/SYS201311030011041289740008_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001104128974082/SYS201311030011041289740008_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001104128974082/SYS201311030011041289740008_ST/images3.png)
D.
查看答案
小敏在今年的校运动会跳远比赛中跳出了满意一跳,函数h=3.5t-4.9t
2(t的单位:s,h的单位:m)可以描述他跳跃时重心高度的变化,则他起跳后到重心最高时所用的时间是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001104128974082/SYS201311030011041289740007_ST/images0.png)
A.0.71s
B.0.70s
C.0.63s
D.0.36s
查看答案