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在△ABC中,点M满足,若 ,则实数m的值是( ) A.3 B. C. D.-3...
在△ABC中,点M满足
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124148874582990/SYS201310251241488745829006_ST/0.png)
,若
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,则实数m的值是( )
A.3
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124148874582990/SYS201310251241488745829006_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124148874582990/SYS201310251241488745829006_ST/3.png)
D.-3
考点分析:
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