=(1-1/2)+(1/2-1/3)+(1/3+1/4)+···+(1/98-1/99)+(1/99-1/100)=1-1/2+1/2-1/3+1/3-1/3+···-1/99+1/99-1/100=1+0+0+···+0-1/100=99/100【OVER~这行不用抄】--------------------------------------------------------------ps:答案不够1,所以一分不给?