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井邊有容量5公升跟3公升的兩個水桶,726Please respect copyright.PENANACvI3Z9rL0s
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該如何利用這兩個水桶,裝出剛好4公升的水呢?726Please respect copyright.PENANAyFTHkOWYK6
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726Please respect copyright.PENANAChwe1vfaF4
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