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在平行四边形ABCD中,AC为一条对角线,,,则=( ) A.(2,4) B.(...
在平行四边形ABCD中,AC为一条对角线,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102747346860844/SYS201311031027473468608002_ST/0.png)
,
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,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102747346860844/SYS201311031027473468608002_ST/2.png)
=( )
A.(2,4)
B.(1,1)
C.(-1,-1)
D.(-2,-4)
考点分析:
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