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已知O是坐标原点,点A(-1,1),若点M(x,y)为平面区域,上的一个动点,则...
已知O是坐标原点,点A(-1,1),若点M(x,y)为平面区域
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101006058941010/SYS201311031010060589410005_ST/0.png)
,上的一个动点,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101006058941010/SYS201311031010060589410005_ST/1.png)
•
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101006058941010/SYS201311031010060589410005_ST/2.png)
的取值范围是( )
A.[-1,0]
B.[0,1]
C.[0,2]
D.[-1,2]
考点分析:
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已知向量
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,
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满足(
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+2
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)•(
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-
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)=-6,且|
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|=1,|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101006058941010/SYS201311031010060589410004_ST/7.png)
|=2,则
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与
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C.
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