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因為一周有7天為奇數,所以在同一個月內周日的日期肯定是奇偶相間的,所以題中五個周日日期依次為偶奇偶奇偶. 所以第一個周日為2號,以下依次為9,16,23,30 另外如果第一個周日是4號的話,可以得出第五個周日為32號,須捨去,所以2/9/16/23/30是符合題意的唯一解
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