=1+1/2+(1/3+2/3)+……+(1/60+……+59/60)1/60+……+59/60=(1/60+59/60)+……(29/60+31/60)+30/60=29*1+1/2=(60-1)/21/59+……+58/59=(1/59+58/59)+……(29/59+30/59)=29*1=(59-1)/2……所以原式=1+[(2+……+60)-59]...