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Re:不知道有没有反例了...两条规律一起用

Posted by anyl94xh at 2011-10-24 18:16:08 on Problem 1047
In Reply To:不知道有没有反例了...两条规律一起用 Posted by:szxyj at 2011-04-08 21:21:37 
楼上有个地方写反了
应该是
n*(n+1)/2   (a1+a2+……+an)*111……111 
--------- = -----------------------
  (n+1)            999……999   
即
n/2=(a1+a2+……+an)/9
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