送交者: hootoo 于 2009-01-30, 18:41:58:

回答: The result should be 1995/1996 由 chinada 于 2009-01-30, 16:45:39:

• 1/(n*(n+1))=(n+1-n)/(n*(n+1))=1/n - 1/(n+1) - 插一腿 (1 bytes) 2009-01-30, 20:47:47 (296493)
  • 1/2 + 1/2 -1/1996 = 1995/1996 (无内容) - 插一腿 (0 bytes) 2009-01-30, 20:50:30 (296494)
    • 赞一个！不愧是学数学出身，宝腿未老！ (无内容) - 找老婆专用ID (0 bytes) 2009-01-30, 21:33:10 (296501)

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