二次函数
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000855587328010/SYS201311030008555873280011_ST/0.png)
的顶点坐标是
.
考点分析:
相关试题推荐
若反比例函数y=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000855587328010/SYS201311030008555873280010_ST/0.png)
在第一,三象限,则k的取值范围是
.
查看答案
已知二次函数y=ax
2+bx+c的图象如图所示,对称轴是x=1,则下列结论中正确的是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000855587328010/SYS201311030008555873280009_ST/images0.png)
A.ac>0
B.b<0
C.b
2-4ac<0
D.2a+b=0
查看答案
(易错题)如图,将△ABC的三边缩小为原来的
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000855587328010/SYS201311030008555873280008_ST/0.png)
.任取一点O,连AO、BO、CO,并取它们的中点D、E、F,得△DEF,下列说法正确的个数是( )
①△ABC与△DEF是位似图形
②△ABC与△DEF是相似图形
③△ABC与△DEF周长之比为2:1
④△ABC与△DEF的面积之比为4:1.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000855587328010/SYS201311030008555873280008_ST/images1.png)
A.1个
B.2个
C.3个
D.4个
查看答案
下面四组线段中,不能成比例的是( )
A.a=3,b=6,c=2,d=4
B.a=1,b=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000855587328010/SYS201311030008555873280007_ST/0.png)
,c=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000855587328010/SYS201311030008555873280007_ST/1.png)
,d=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000855587328010/SYS201311030008555873280007_ST/2.png)
C.a=4,b=4,c=5,d=10
D.a=2,b=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000855587328010/SYS201311030008555873280007_ST/3.png)
,c=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000855587328010/SYS201311030008555873280007_ST/4.png)
,d=
查看答案
在匀速运动中,路程S(千米)一定时,速度v(千米/时)关于时间t(小时)的函数图象大致是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000855587328010/SYS201311030008555873280006_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000855587328010/SYS201311030008555873280006_ST/images1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000855587328010/SYS201311030008555873280006_ST/images2.png)
D.
查看答案