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井邊有容量5公升跟3公升的兩個水桶,656Please respect copyright.PENANAEpNIqX9Szw
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該如何利用這兩個水桶,裝出剛好4公升的水呢?656Please respect copyright.PENANAZlGHuOeYCz
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656Please respect copyright.PENANAkvk409zKq3
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