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井邊有容量5公升跟3公升的兩個水桶,679Please respect copyright.PENANA32W6XlMyVP
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該如何利用這兩個水桶,裝出剛好4公升的水呢?679Please respect copyright.PENANABC7P3JeYt0
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679Please respect copyright.PENANADwHDDZC8TG
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