满分5 >
初中数学试题 >
在△ABC和△DEF中,AB=2DE,AC=2DF,∠A=∠D,如果△ABC的周...
在△ABC和△DEF中,AB=2DE,AC=2DF,∠A=∠D,如果△ABC的周长是16,面积是12,那么△DEF的周长、面积依次为( )
A.8,3
B.8,6
C.4,3
D.4,6
考点分析:
相关试题推荐
如图,∠AOB=90°,∠B=30°,△A′OB′可以看作是由△AOB绕点O顺时针旋转α角度得到的.若点A′在AB上,则旋转角α的大小可以是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000638850374069/SYS201311030006388503740005_ST/images0.png)
A.30°
B.45°
C.60°
D.90°
查看答案
在Rt△ABC中,∠C=90°,AB=4,BC=1,则cosA的值是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000638850374069/SYS201311030006388503740004_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000638850374069/SYS201311030006388503740004_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000638850374069/SYS201311030006388503740004_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000638850374069/SYS201311030006388503740004_ST/2.png)
D.4
查看答案
如图所示,小区公园里有一块圆形地面被黑白石子铺成了面积相等的八部分,阴影部分是黑色石子,小华随意向其内部抛一个小球,则小球落在黑色石子区域内的概率是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000638850374069/SYS201311030006388503740003_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000638850374069/SYS201311030006388503740003_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000638850374069/SYS201311030006388503740003_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000638850374069/SYS201311030006388503740003_ST/2.png)
D.
查看答案
方程x
2=3x的解是( )
A.x=0
B.x
1=0,x
2=-3
C.x=3
D.x
1=0,x
2=3
查看答案
函数
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000638850374069/SYS201311030006388503740001_ST/0.png)
中,自变量x的取值范围是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000638850374069/SYS201311030006388503740001_ST/1.png)
B.x≥
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000638850374069/SYS201311030006388503740001_ST/2.png)
C.x≤
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000638850374069/SYS201311030006388503740001_ST/3.png)
D.
查看答案