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井邊有容量5公升跟3公升的兩個水桶,733Please respect copyright.PENANABCF8nSPbaN
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該如何利用這兩個水桶,裝出剛好4公升的水呢?733Please respect copyright.PENANA6WP5Mhf0mW
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733Please respect copyright.PENANAmwsJJa2fpd
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