满分5 >
初中数学试题 >
正六边形的对称轴共有( ) A.1条 B.3条 C.6条 D.12条
正六边形的对称轴共有( )
A.1条
B.3条
C.6条
D.12条
考点分析:
相关试题推荐
已知平行四边形的一边长是14,下列各组数中能分别作为它的两条对角线的是( )
A.10与16
B.12与16
C.20与22
D.10与40
查看答案
抛物线y=2x
2-3x+l的顶点坐标为( )
A.(-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192551422601346/SYS201311011925514226013005_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192551422601346/SYS201311011925514226013005_ST/1.png)
)
B.(
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192551422601346/SYS201311011925514226013005_ST/2.png)
,-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192551422601346/SYS201311011925514226013005_ST/3.png)
)
C.(
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192551422601346/SYS201311011925514226013005_ST/4.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192551422601346/SYS201311011925514226013005_ST/5.png)
)
D.(-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192551422601346/SYS201311011925514226013005_ST/6.png)
,-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192551422601346/SYS201311011925514226013005_ST/7.png)
)
查看答案
若
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192551422601346/SYS201311011925514226013004_ST/0.png)
,则a的取值范围是( )
A.a≥0
B.a≥
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192551422601346/SYS201311011925514226013004_ST/1.png)
C.a≤
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192551422601346/SYS201311011925514226013004_ST/2.png)
D.全体实数
查看答案
下列命题中,假命题是( )
A.9的算术平方根是3
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192551422601346/SYS201311011925514226013003_ST/0.png)
的平方根是±2
C.27的立方根是±3
D.立方根等于-1的实数是-1
查看答案
与三角形三个顶点距离相等的点,是这个三角形的( )
A.三条中线的交点
B.三条角平分线的交点
C.三条高的交点
D.三边的垂直平分线的交点
查看答案