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井邊有容量5公升跟3公升的兩個水桶,597Please respect copyright.PENANARmCiYDWzv7
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該如何利用這兩個水桶,裝出剛好4公升的水呢?597Please respect copyright.PENANA0cT6xYtKrn
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597Please respect copyright.PENANA79RDgNlVWT
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