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井邊有容量５公升跟３公升的兩個水桶，703Please respect copyright.ＰＥＮＡＮＡ1LnBvGS84t
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該如何利用這兩個水桶，裝出剛好４公升的水呢？703Please respect copyright.ＰＥＮＡＮＡDqt18MIzRT
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703Please respect copyright.ＰＥＮＡＮＡj7DjmFwlQy
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