四只
前面两个剩下后面两个
后面两个剩下前面两个
前后两个中间有两个~= =
河里有一行鸭子,二只的前面有二只,二只的后面有二只,二只的中间有二只.一共有多少只
河里有一行鸭子,二只的前面有二只,二只的后面有二只,二只的中间有二只.一共有多少只
其他人气：432 ℃时间：2020-02-03 21:01:25
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