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如图,在△ABC中,DE∥BC,且DE=2cm,,则BC= cm,= .
如图,在△ABC中,DE∥BC,且DE=2cm,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101802288577401/SYS201311031018022885774017_ST/0.png)
,则BC=
cm,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101802288577401/SYS201311031018022885774017_ST/1.png)
=
.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101802288577401/SYS201311031018022885774017_ST/images2.png)
考点分析:
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