1⼀1*2+1⼀2*3+1⼀3*4+..........+1⼀98*99+1⼀99*100计算结果是多少?

1/1*2+1/2*3+1/3*4+..........+1/98*99+1/99*100计算结果是多少?答案为99/100
2024-12-23 04:38:53
推荐回答(4个)
回答1:

1/1*2+1/2*3+1/3*4+..........+1/98*99+1/99*100
=1-1/2+1/2-1/3+1/3-1/4+……+1/99-1/100
中间抵消
=1-1/100
=99/100

回答2:

解:因为:1/n-1/(n+1)=1/[n(n+1)]
所以,
1/(1×2)+1/(2×3)+1/(3×4)+..........+1/(98×99)+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
=1-1/100
=99/100

回答3:

原式=1-1/2+1/2-1/3+1/3-1/4…+1/98-1/99+1/99-1/100=1-1/100=99/100

回答4:

解 原式=1-1/2+1/2-1/3+1/3-1/4.......+1/99-1/100
=1-1/100
=99/100