UC知道1/1*2+1/2*3+1/3*4+1/4*5...+1/99*100
来源：百度知道 编辑：UC知道 时间：2024/05/04 13:51:40
y=1/n(n+1) n=1、2......99
y=1/n-1/(n+1)
=1-1/2+1/2-1/3+1/3-1/4......1/99-1/100
=1-1/100
=0.99
楼上对，还有一种推理算法：
1/1*2+1/2*3=2/3
1/1*2+1/2*3+1/3*4=3/4
1/1*2+1/2*3+1/3*4+1/4*5=4/5
...
1/1*2+1/2*3+1/3*4+1/4*5...+1/99*100=99/100即0.99
灌水
0.99
精彩
（1/1*2+1/99*100）*50
(1/2005-1)(1/2004-1)........(1/3-1)(1/2-1)
1+1/2+1/3+.....+1/n
1+1/2+1/3+...+1/100
1-1/2+1/3-.....-1/10
(1+1/2+1/3+1/4)×
(1-1/2)(1-1/3)(1-1/4)(1-1/5).....(1-1/1000)
1+1/(1+2)+1/(1+2+3)+...+1/(1+2+3+...+100)
1+1/(1+2)+1/(1+2+3)+-------+1/(1+2+3+----+100)
1+1/1+2+1/1+2+3+...+1/1+2+3...+2000
1+1/1+2+1/1+2+3.........+1/1+2+3.....100