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井邊有容量5公升跟3公升的兩個水桶,681Please respect copyright.PENANA5yY3akcZkp
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該如何利用這兩個水桶,裝出剛好4公升的水呢?681Please respect copyright.PENANABqwUlzoozW
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681Please respect copyright.PENANA7lNCuHSzhX
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