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井邊有容量5公升跟3公升的兩個水桶,634Please respect copyright.PENANAIvbJ8f42Eq
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該如何利用這兩個水桶,裝出剛好4公升的水呢?634Please respect copyright.PENANAQjUXnlcVLv
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634Please respect copyright.PENANAn3OAtoYnrX
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