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井邊有容量5公升跟3公升的兩個水桶,653Please respect copyright.PENANAyP9p8sfrqA
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該如何利用這兩個水桶,裝出剛好4公升的水呢?653Please respect copyright.PENANAiTG4Hje85o
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653Please respect copyright.PENANAhhWuYgpMmO
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3.147.140.129
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