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井邊有容量5公升跟3公升的兩個水桶,491Please respect copyright.PENANAKaBt5D6LnW
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該如何利用這兩個水桶,裝出剛好4公升的水呢?491Please respect copyright.PENANAw9m0yxAmUK
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491Please respect copyright.PENANAnufJ9AlTWh
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