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井邊有容量5公升跟3公升的兩個水桶,586Please respect copyright.PENANAMNCn996gFU
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該如何利用這兩個水桶,裝出剛好4公升的水呢?586Please respect copyright.PENANA1Wfda4r0Fw
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586Please respect copyright.PENANAZhTUbLhgJZ
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