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已知:如图,AD:AB=1:3,DE∥BC,则S△ADE:S△ABC= .
已知:如图,AD:AB=1:3,DE∥BC,则S
△ADE:S
△ABC=
.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101802288577401/SYS201311031018022885774018_ST/images0.png)
考点分析:
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,则BC=
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