满分5 >
高中数学试题 >
在长方体ABCD-A1B1C1D1中,AB=BC=3,AA1=4,则异面直线AB...
在长方体ABCD-A1B1C1D1中,AB=BC=3,AA1=4,则异面直线AB1与 A1D所成的角的余弦值为 .
考点分析:
相关试题推荐
若集合M={x,y,z},集合N={-1,0,1},f是从M到N的映射,则满足f(x)+f(y)+f(z)=0的映射有( )
A.6个
B.7个
C.8个
D.9个
查看答案
如图,已知矩形ABCD中,AB=3,BC=a,若PA⊥平面AC,在BC边上取点E,使PE⊥DE,则满足条件的E点有2个时,a的取值范围是( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225307965145290/SYS201311012253079651452008_ST/images0.png)
A.a>6
B.a≥6
C.0<a<6
D.0<a≤6
查看答案
正四面体A-BCD棱长为1,点P在AB上移动,点Q在CD上移动,则PQ的最小值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225307965145290/SYS201311012253079651452007_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225307965145290/SYS201311012253079651452007_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225307965145290/SYS201311012253079651452007_ST/2.png)
D.
查看答案
若直线l与平面α所成角为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225307965145290/SYS201311012253079651452006_ST/0.png)
,直线a在平面α内,且与直线l异面,则直线l与直线a所成的角的取值范围是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225307965145290/SYS201311012253079651452006_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225307965145290/SYS201311012253079651452006_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225307965145290/SYS201311012253079651452006_ST/3.png)
D.
查看答案