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如图,在△ABC中,DE∥BC,AD=8cm,AE=6cm,CE=3cm,那么D...
如图,在△ABC中,DE∥BC,AD=8cm,AE=6cm,CE=3cm,那么DB=
cm.
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如图所示,设M是△ABC的重心,过M的直线分别交边AB,AC于P,Q两点,且
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=m,
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=n,则
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=
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在同一时刻物高与影长成比例,小莉量得综合楼的影长为6米,同一时刻他量得身高1.6米的同学的影长为0.6米,则综合楼高为
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如图,l
1∥l
2∥l
3,BC=3,
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如图,AD是△ABC的中线,AE=EF=FC,BE交AD于点G,则
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如图,D、E分别是△ABC的边AB、AC上的点,DE∥BC,若
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