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井邊有容量5公升跟3公升的兩個水桶,700Please respect copyright.PENANA2GNBxrMfuM
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該如何利用這兩個水桶,裝出剛好4公升的水呢?700Please respect copyright.PENANArfYlhy4umg
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700Please respect copyright.PENANA14m9BcGKOr
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