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井邊有容量5公升跟3公升的兩個水桶,676Please respect copyright.PENANASDw9YYtjuH
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該如何利用這兩個水桶,裝出剛好4公升的水呢?676Please respect copyright.PENANA9lkYv1rgMa
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676Please respect copyright.PENANAXxOI0jzsJ3
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