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井邊有容量5公升跟3公升的兩個水桶,469Please respect copyright.PENANA6ckUbWkW4Y
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該如何利用這兩個水桶,裝出剛好4公升的水呢?469Please respect copyright.PENANAknWDk19e1O
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469Please respect copyright.PENANAbL6gMM40at
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