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井邊有容量5公升跟3公升的兩個水桶,722Please respect copyright.PENANALFzeBebAZP
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該如何利用這兩個水桶,裝出剛好4公升的水呢?722Please respect copyright.PENANAdx6kj6mull
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722Please respect copyright.PENANAkBDCSx9fiQ
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