满分5 >
初中数学试题 >
下列长度的三条线段,能组成三角形的是( ) A.1、l、2 B.3、4、5 C....
下列长度的三条线段,能组成三角形的是( )
A.1、l、2
B.3、4、5
C.1、4、6
D.2、3、7
考点分析:
相关试题推荐
如图是某商场一楼与二楼之间的手扶电梯示意图.其中AB,CD分别表示一楼,二楼地面的水平线,∠ABC=150°,BC的长是8m,则乘电梯从点B到点C上升的高度h是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101191024760781605/SYS201311011910247607816004_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101191024760781605/SYS201311011910247607816004_ST/0.png)
m
B.4m
C.4
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101191024760781605/SYS201311011910247607816004_ST/1.png)
m
D.8m
查看答案
如图,C,D是线段AB上两点,若CB=4cm,DB=7cm,且D是AC的中点,则AC的长等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101191024760781605/SYS201311011910247607816003_ST/images0.png)
A.3cm
B.6cm
C.11cm
D.14cm
查看答案
在平面直角坐标系中,点(-7,-2m+1)在第三象限,则m的取值范围是( )
A.m<
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101191024760781605/SYS201311011910247607816002_ST/0.png)
B.m>-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101191024760781605/SYS201311011910247607816002_ST/1.png)
C.m<-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101191024760781605/SYS201311011910247607816002_ST/2.png)
D.m>
查看答案
下列计算中,正确的是( )
A.2x+3y=5xy
B.x•x
4=x
4C.x
8÷x
2=x
4D.(x
2y)
3=x
6y
3
查看答案
下列各数中,相反数等于
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101191024760781605/SYS201311011910247607816000_ST/0.png)
的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101191024760781605/SYS201311011910247607816000_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101191024760781605/SYS201311011910247607816000_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101191024760781605/SYS201311011910247607816000_ST/3.png)
D.-
查看答案