已知|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882012_ST/0.png)
|=|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882012_ST/1.png)
|=2,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882012_ST/2.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882012_ST/3.png)
的夹角为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882012_ST/4.png)
,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882012_ST/5.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882012_ST/6.png)
在
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882012_ST/7.png)
上的投影为
.
考点分析:
相关试题推荐
已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882011_ST/0.png)
,|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882011_ST/1.png)
|=3,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882011_ST/2.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882011_ST/3.png)
,如图,若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882011_ST/4.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882011_ST/5.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882011_ST/6.png)
,D为BD的中点,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882011_ST/7.png)
|为( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882011_ST/images8.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882011_ST/8.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882011_ST/9.png)
C.7
D.18
查看答案
已知O为原点,点A、B的坐标分别为(a,0),(0,a)其中常数a>0,点P在线段AB上,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882010_ST/0.png)
=t
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882010_ST/1.png)
(0≤t≤1),则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882010_ST/2.png)
•
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882010_ST/3.png)
的最大值为( )
A.a
B.2a
C.3a
D.a
2
查看答案
函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882009_ST/0.png)
是奇函数,则tanθ等于( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882009_ST/1.png)
B.-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882009_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882009_ST/3.png)
D.-
查看答案
有一对酷爱运动的年轻夫妇给他们12个月大的婴儿3块分别写有“20”,“08”和“北京”的字块,如果婴儿能够排成“2008北京”或者“北京2008”,则他们就给婴儿奖励.假设婴儿能将字块横着正排,那么这个婴儿能得到奖励的概率是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882008_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882008_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882008_ST/2.png)
D.
查看答案
一个袋中装有2个红球和2个白球,现从袋中取出1球,然后放回袋中再取出一球,则取出的两个球同色的概率为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882007_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882007_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003195488253/SYS201311012300031954882007_ST/2.png)
D.
查看答案