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如图,在△ABC中,DE∥BC,AD=3,BD=2,那么DE:BC的值是 .
如图,在△ABC中,DE∥BC,AD=3,BD=2,那么DE:BC的值是
.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161740438437289/SYS201310221617404384372015_ST/images0.png)
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已知向量
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、
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