满分5 >
高中数学试题 >
已知向量,满足||=||=2,•=0,若向量向量与-共线,则|+|的最小值为( ...
已知向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183424673816982/SYS201310241834246738169007_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183424673816982/SYS201310241834246738169007_ST/1.png)
满足|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183424673816982/SYS201310241834246738169007_ST/2.png)
|=|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183424673816982/SYS201310241834246738169007_ST/3.png)
|=2,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183424673816982/SYS201310241834246738169007_ST/4.png)
•
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183424673816982/SYS201310241834246738169007_ST/5.png)
=0,若向量向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183424673816982/SYS201310241834246738169007_ST/6.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183424673816982/SYS201310241834246738169007_ST/7.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183424673816982/SYS201310241834246738169007_ST/8.png)
共线,则|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183424673816982/SYS201310241834246738169007_ST/9.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183424673816982/SYS201310241834246738169007_ST/10.png)
|的最小值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183424673816982/SYS201310241834246738169007_ST/11.png)
B.1
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183424673816982/SYS201310241834246738169007_ST/12.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183424673816982/SYS201310241834246738169007_ST/13.png)
考点分析:
相关试题推荐
函数f(x)是定义在R上的增函数,y=f
-1(x)是它的反函数,若f(3)=0,f(2):a,f
-1(2)=b,f
-1(0)=c,则a,b,c的大小关系为( )
A.c>a>b
B.b>c>a
C.b>a>c
D.a>b>c
查看答案
2010年广州亚运会期间,某国代表团计划在比赛全部结束后,顺便从7个他们最喜爱的中国城市里选择5个进行游览.如果M、N为必选城市,并且在游览过程中必须按先M后N的次序经过M、N两城市(游览M、N两城市的次序可以不相邻),则他们可选择的不同游览线路有( )
A.120种
B.240种
C.480种
D.600种
查看答案
设ω>0,函数y=sin(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183424673816982/SYS201310241834246738169004_ST/0.png)
)+2的图象按
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183424673816982/SYS201310241834246738169004_ST/1.png)
=(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183424673816982/SYS201310241834246738169004_ST/2.png)
),平移后与原图象重合,则ω的最小值是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183424673816982/SYS201310241834246738169004_ST/3.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183424673816982/SYS201310241834246738169004_ST/4.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183424673816982/SYS201310241834246738169004_ST/5.png)
D.2
查看答案
设p:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183424673816982/SYS201310241834246738169002_ST/0.png)
成等比数列;q:lgx,lg(x+1),lg(x+3)成等差数列,则条件p是条件q成立的( )
A.充分不必要条件
B.必要不充分条件
C.充要条件
D.既木充分也不必要条件
查看答案