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已知向量=(,),=(,-),双曲线•=1上一点M到F(7,0)的距离为11,N...
已知向量
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=(
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,
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),
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=(
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,-
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),双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024180248775611612/SYS201310241802487756116003_ST/6.png)
•
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=1上一点M到F(7,0)的距离为11,N是MF的中点,O为坐标原点,则|ON|=( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024180248775611612/SYS201310241802487756116003_ST/8.png)
B.
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C.
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D.
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或
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考点分析:
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