100/20=50/__=__/60=200/__=__/80求解

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100/20=50/__=__/60=200/__=__/80求解
100/20=50/__=__/60=200/__=__/80求解

100/20=50/__=__/60=200/__=__/80求解
100/20=50/_10_=_300_/60=200/40__=_400_/80
根据商不变性质!