根据:1/1×2=1/1-1/21/2×3=1/2-1/3算一算:1/1×2+1/2×3+1/3×4+ …… +1/99×100除了1/1×2+1/2×3+1/3×4+ …… +1/99×100=1/1-1/2+1/2-1/3+1/3-1/4+…+1/98-1/99+1/99-1/100=1/1-1/100=99/100
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/01 05:07:12
![根据:1/1×2=1/1-1/21/2×3=1/2-1/3算一算:1/1×2+1/2×3+1/3×4+ …… +1/99×100除了1/1×2+1/2×3+1/3×4+ …… +1/99×100=1/1-1/2+1/2-1/3+1/3-1/4+…+1/98-1/99+1/99-1/100=1/1-1/100=99/100](/uploads/image/z/1689851-11-1.jpg?t=%E6%A0%B9%E6%8D%AE%EF%BC%9A1%2F1%C3%972%3D1%2F1-1%2F21%2F2%C3%973%3D1%2F2-1%2F3%E7%AE%97%E4%B8%80%E7%AE%97%EF%BC%9A1%2F1%C3%972%2B1%2F2%C3%973%2B1%2F3%C3%974%2B+%E2%80%A6%E2%80%A6+%2B1%2F99%C3%97100%E9%99%A4%E4%BA%861%2F1%C3%972%2B1%2F2%C3%973%2B1%2F3%C3%974%2B+%E2%80%A6%E2%80%A6+%2B1%2F99%C3%97100%3D1%2F1-1%2F2%2B1%2F2-1%2F3%2B1%2F3-1%2F4%2B%E2%80%A6%2B1%2F98-1%2F99%2B1%2F99-1%2F100%3D1%2F1-1%2F100%3D99%2F100)
根据:1/1×2=1/1-1/21/2×3=1/2-1/3算一算:1/1×2+1/2×3+1/3×4+ …… +1/99×100除了1/1×2+1/2×3+1/3×4+ …… +1/99×100=1/1-1/2+1/2-1/3+1/3-1/4+…+1/98-1/99+1/99-1/100=1/1-1/100=99/100
根据:1/1×2=1/1-1/2
1/2×3=1/2-1/3
算一算:1/1×2+1/2×3+1/3×4+ …… +1/99×100
除了1/1×2+1/2×3+1/3×4+ …… +1/99×100
=1/1-1/2+1/2-1/3+1/3-1/4+…+1/98-1/99+1/99-1/100
=1/1-1/100
=99/100
根据:1/1×2=1/1-1/21/2×3=1/2-1/3算一算:1/1×2+1/2×3+1/3×4+ …… +1/99×100除了1/1×2+1/2×3+1/3×4+ …… +1/99×100=1/1-1/2+1/2-1/3+1/3-1/4+…+1/98-1/99+1/99-1/100=1/1-1/100=99/100
1/1×2=1/1-1/2
1/2×3=1/2-1/3
1/3×4=1/3-1/4
.
1/99*100=1/99-1/100
所以,原题可替换为右边的形式,结果为1/1-1/2+1/2-1/3+1/3-1/4+.+1/99-1/100
=1-1/100=99/100
1/1×2+1/2×3+1/3×4+ …… +1/99×100
=1/1-1/2+1/2-1/3+1/3-1/4+…+1/98-1/99+1/99-1/100
=1/1-1/100
=99/100
....详细理由..没啊......这是推导出来的....1/n(n+1)=1/n-1/n+1
=1-1/2+1/2-1/3+……+1/99-1/100
=1+(1/2-1/2)+(1/3-1/3)+……+(1/99-1/99)-1/100
=1-1/100
=99/100
应用应用1/n*1/(n+1)=1/n-1/(n+1)
这已经很简便了