1⼀2+5⼀6+11⼀12+201919⼀20+29⼀30+......+9701⼀9702+9899⼀9900=

2024-12-25 20:07:55
推荐回答(1个)
回答1:

题出错了吧……
1/2+5/6+11/12+19/20+29/30+......+9701/9702+9899/9900
=(1-1/1*1/2)+(1-1/2*1/3)+(1-1/3*1/4)+(1-1/4*1/5)+...+(1-1/98*1/99)+(1-1/99*1/100)
=99-(1-1/2+1/2-1/3+1/3-1/4+...+1/98-1/99+1/99-1/100)
=99-(1-1/100)
=99-99/100
=891/100