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如图,△ABC中,DE∥BC,AD=2,DB=3,则DE:BC的值是 .
如图,△ABC中,DE∥BC,AD=2,DB=3,则DE:BC的值是
.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101719103331488/SYS201311031017191033314023_ST/images0.png)
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在△ABC中,若D、E分别是边AB、AC上的点,且DE∥BC,AD=1,DB=2,则△ADE与△ABC的面积比为
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如图,已知△ABC的面积S
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在图1中,若
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101719103331488/SYS201311031017191033314018_ST/0.png)
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![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101719103331488/SYS201311031017191033314018_ST/1.png)
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![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101719103331488/SYS201311031017191033314018_ST/2.png)
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![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101719103331488/SYS201311031017191033314018_ST/3.png)
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在图3中,若
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![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101719103331488/SYS201311031017191033314018_ST/5.png)
;
按此规律,若
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,S
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