满分5 >
高中数学试题 >
已知平面上直线l的方向向量=(-,),点O(0,0)和A(1,-2)在l上的射影...
已知平面上直线l的方向向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224733606622350/SYS201311012247336066223007_ST/0.png)
=(-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224733606622350/SYS201311012247336066223007_ST/1.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224733606622350/SYS201311012247336066223007_ST/2.png)
),点O(0,0)和A(1,-2)在l上的射影分别是O'和A′,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224733606622350/SYS201311012247336066223007_ST/3.png)
=λ
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224733606622350/SYS201311012247336066223007_ST/4.png)
,其中λ等于( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224733606622350/SYS201311012247336066223007_ST/5.png)
B.-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224733606622350/SYS201311012247336066223007_ST/6.png)
C.2
D.-2
考点分析:
相关试题推荐
若不等式|x-1|<a成立的充分条件是0<x<4,则实数a的取值范围是( )
A.a≥3
B.a≤3
C.a≥1
D.a≤1
查看答案
已知函数y=Asin(ωx+φ)+k的最大值是4,最小值是0,最小正周期是
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224733606622350/SYS201311012247336066223005_ST/0.png)
,直线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224733606622350/SYS201311012247336066223005_ST/1.png)
是其图象的一条对称轴,则下面各式中符合条件的解析式是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224733606622350/SYS201311012247336066223005_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224733606622350/SYS201311012247336066223005_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224733606622350/SYS201311012247336066223005_ST/4.png)
D.
查看答案
如果函数y=2sinx+acosx的值域为[-3,3],则a等于( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224733606622350/SYS201311012247336066223004_ST/0.png)
B.±1
C.±
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224733606622350/SYS201311012247336066223004_ST/1.png)
D.±
查看答案
在平行四边形ABCD中,AC为一条对角线,若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224733606622350/SYS201311012247336066223003_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224733606622350/SYS201311012247336066223003_ST/1.png)
,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224733606622350/SYS201311012247336066223003_ST/2.png)
=( )
A.(-2,-4)
B.(-3,-5)
C.(3,5)
D.(2,4)
查看答案
设a<b<0,则下列不等式不成立的是( )
A.a
2>b
2B.|a|>|b|
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224733606622350/SYS201311012247336066223002_ST/0.png)
D.
查看答案