井邊有容量5公升跟3公升的兩個水桶,657Please respect copyright.PENANAAhEjREVZez
該如何利用這兩個水桶,裝出剛好4公升的水呢?657Please respect copyright.PENANA0jczo0A2AL
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井邊有容量5公升跟3公升的兩個水桶,657Please respect copyright.PENANAAhEjREVZez
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該如何利用這兩個水桶,裝出剛好4公升的水呢?657Please respect copyright.PENANA0jczo0A2AL
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657Please respect copyright.PENANAyS09AKbXcN
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