问题描述:
1/2*1+1*2*3+1/3*4+………+1/99*100
(191919/989898+190190/980980+19001900/98009800)/(19/98)*9898/1919
(191919/989898+190190/980980+19001900/98009800)/(19/98)*9898/1919
问题解答:
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