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1/2+5/6+11/12+19/20+39/30+.......+9701/9702+9899/9900

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求解


IP属地:安徽1楼2012-08-21 14:02回复


    IP属地:安徽2楼2012-08-21 14:05
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      1 - 1/1*2 + 1- 1/2*3 + 1 - 1/3*4 + ... + 1 - 1/99*100
      = 99 - (1/1*2+1/2*3+1/3*4+...+1/99*100)
      =99 - (1 - 1/2 + 1/2 - 1/3 + ... + 1/99 - 1/100 )
      =99 - (1 - 1/100)
      =98+1/100


      3楼2012-08-21 14:06
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