小学数学趣味游戏:运送汽油的证明
小学数学趣味游戏:运送汽油的证明一座现代化的大都市建有环形的道路网和连接道路的系统,如图所示。在每一条道路的交叉口,汽油公司都设有一个加油站。
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
请证明油罐车的司机在离开贮油库之后,可以沿路到每一个加油站运送汽油,而不重复经过任何一个加油站再回到贮油库。
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