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设向量,,满足||=||=1,•=,( -)•( -)=0,则||的最大值为( ...
设向量
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,
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,
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满足|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101703367143030/SYS201311031017033671430009_ST/3.png)
|=|
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|=1,
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•
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101703367143030/SYS201311031017033671430009_ST/6.png)
=
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,(
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-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101703367143030/SYS201311031017033671430009_ST/9.png)
)•(
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-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101703367143030/SYS201311031017033671430009_ST/11.png)
)=0,则|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101703367143030/SYS201311031017033671430009_ST/12.png)
|的最大值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101703367143030/SYS201311031017033671430009_ST/13.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101703367143030/SYS201311031017033671430009_ST/14.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101703367143030/SYS201311031017033671430009_ST/15.png)
D.1
考点分析:
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