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如图所示,在平行四边形ABCD中,M,N分别为DC,BC的中点,已知,用表示为 ...
如图所示,在平行四边形ABCD中,M,N分别为DC,BC的中点,已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729744116081/SYS201311031027297441160011_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729744116081/SYS201311031027297441160011_ST/1.png)
用
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729744116081/SYS201311031027297441160011_ST/2.png)
表示为
.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102729744116081/SYS201311031027297441160011_ST/images3.png)
考点分析:
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