满分5 >
初中数学试题 >
五箱苹果的质量分别为(单位:千克):18,20,21,22,19.则这五箱苹果质...
五箱苹果的质量分别为(单位:千克):18,20,21,22,19.则这五箱苹果质量的平均数和中位数分别为( )
A.19和20
B.20和19
C.20和20
D.20和21
考点分析:
相关试题推荐
如图,在▱ABCD中,已知AD=8cm,AB=6cm,DE平分∠ADC交BC边于点E,则BE等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193551822691579/SYS201311011935518226915006_ST/images0.png)
A.2cm
B.4cm
C.6cm
D.8cm
查看答案
如图,BD为⊙O的直径,点A、C均在⊙O上,∠CBD=60°,则∠A的度数为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193551822691579/SYS201311011935518226915005_ST/images0.png)
A.60°
B.30°
C.45°
D.20°
查看答案
下列二次根式中,最简二次根式是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193551822691579/SYS201311011935518226915004_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193551822691579/SYS201311011935518226915004_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193551822691579/SYS201311011935518226915004_ST/2.png)
D.
查看答案
把抛物线y=x
2向右平移1个单位,所得抛物线的函数表达式为( )
A.y=x
2+1
B.y=(x+1)
2C.y=x
2-1
D.y=(x-1)
2
查看答案
如图所示的物体有两个紧靠在一起的圆柱体组成,它的主视图是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193551822691579/SYS201311011935518226915002_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193551822691579/SYS201311011935518226915002_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193551822691579/SYS201311011935518226915002_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193551822691579/SYS201311011935518226915002_ST/images3.png)
D.
查看答案