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井邊有容量5公升跟3公升的兩個水桶,507Please respect copyright.PENANAE3K4Z4vxJw
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該如何利用這兩個水桶,裝出剛好4公升的水呢?507Please respect copyright.PENANAkHv8kQ6wyu
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507Please respect copyright.PENANADE0JgtWAXJ
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