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井邊有容量5公升跟3公升的兩個水桶,725Please respect copyright.PENANAaCl2vU3Vev
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該如何利用這兩個水桶,裝出剛好4公升的水呢?725Please respect copyright.PENANAh7f7QmAE0J
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725Please respect copyright.PENANA3mGl0xviOW
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