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已知向量,满足||=1,||=2,与的夹角为60°,则|-|= .
已知向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230942017823214/SYS201311012309420178232012_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230942017823214/SYS201311012309420178232012_ST/1.png)
满足|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230942017823214/SYS201311012309420178232012_ST/2.png)
|=1,|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230942017823214/SYS201311012309420178232012_ST/3.png)
|=2,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230942017823214/SYS201311012309420178232012_ST/4.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230942017823214/SYS201311012309420178232012_ST/5.png)
的夹角为60°,则|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230942017823214/SYS201311012309420178232012_ST/6.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230942017823214/SYS201311012309420178232012_ST/7.png)
|=
.
考点分析:
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