满分5 >
初中数学试题 >
如图,在▱ABCD中,AB:AD=3:2,∠ADB=60°,那么cos∠A的值等...
如图,在▱ABCD中,AB:AD=3:2,∠ADB=60°,那么cos∠A的值等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000413861581389/SYS201311030004138615813008_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000413861581389/SYS201311030004138615813008_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000413861581389/SYS201311030004138615813008_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000413861581389/SYS201311030004138615813008_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000413861581389/SYS201311030004138615813008_ST/3.png)
考点分析:
相关试题推荐
下列说法正确的是( )
A.对应边都成比例的多边形相似
B.对应角都相等的多边形相似
C.边数相同的正多边形相似
D.矩形都相似
查看答案
已知Rt△ABC中,∠C=90°,BC=9,AB=15,则sinA的值是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000413861581389/SYS201311030004138615813006_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000413861581389/SYS201311030004138615813006_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000413861581389/SYS201311030004138615813006_ST/2.png)
D.
查看答案
△ABC中,已知∠A=30°,AB=2,AC=4,则△ABC的面积是( )
A.4
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000413861581389/SYS201311030004138615813005_ST/0.png)
B.4
C.2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000413861581389/SYS201311030004138615813005_ST/1.png)
D.2
查看答案
已知△ABC与△A
1B
1C
1位似,△ABC与△A
2B
2C
2位似,则( )
A.△A
1B
1C
1与△A
2B
2C
2全等
B.△A
1B
1C
1与△A
2B
2C
2位似
C.△A
1B
1C
1与△A
2B
2C
2相似但不一定位似
D.△A
1B
1C
1与△A
2B
2C
2不相似
查看答案
某闭合电路中,电源的电压为定值,电流I(A)与电阻R(Ω)成反比例.如图所示的是该电路中电流I与电阻R之间的函数关系的图象,则用电阻R表示电流I的函数解析式为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000413861581389/SYS201311030004138615813003_ST/images0.png)
A.I=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000413861581389/SYS201311030004138615813003_ST/0.png)
B.I=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000413861581389/SYS201311030004138615813003_ST/1.png)
C.I=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000413861581389/SYS201311030004138615813003_ST/2.png)
D.I=
查看答案