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1. 把5L水桶裝滿倒進3L中，剩2L。636Please respect copyright.ＰＥＮＡＮＡVvxR2gkkME
8964 copyright protection632ＰＥＮＡＮＡv6OIXs8Nyc 維尼

2. 3L水桶倒空，2L從5L水桶倒過來後，把5L再次裝滿。636Please respect copyright.ＰＥＮＡＮＡdoxVGcmNMb
8964 copyright protection632ＰＥＮＡＮＡBi7Cl5OVhl 維尼

3. 再從5L水桶倒出1L到3L水桶，就OK了。636Please respect copyright.ＰＥＮＡＮＡcBAoLZ77XW
8964 copyright protection632ＰＥＮＡＮＡij3fkn2DJH 維尼

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