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若两个非零向量,满足|+|=|-|=2||,则向量+与-的夹角是( ) A. B...
若两个非零向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231737204811784/SYS201311012317372048117007_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231737204811784/SYS201311012317372048117007_ST/1.png)
满足|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231737204811784/SYS201311012317372048117007_ST/2.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231737204811784/SYS201311012317372048117007_ST/3.png)
|=|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231737204811784/SYS201311012317372048117007_ST/4.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231737204811784/SYS201311012317372048117007_ST/5.png)
|=2|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231737204811784/SYS201311012317372048117007_ST/6.png)
|,则向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231737204811784/SYS201311012317372048117007_ST/7.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231737204811784/SYS201311012317372048117007_ST/8.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231737204811784/SYS201311012317372048117007_ST/9.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231737204811784/SYS201311012317372048117007_ST/10.png)
的夹角是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231737204811784/SYS201311012317372048117007_ST/11.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231737204811784/SYS201311012317372048117007_ST/12.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231737204811784/SYS201311012317372048117007_ST/13.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231737204811784/SYS201311012317372048117007_ST/14.png)
考点分析:
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