1⼀1×2+1⼀2×3+1⼀3×4……+1⼀98×99+1⼀99×100简便方法

2025-01-05 01:08:08
推荐回答(5个)
回答1:

原式等于1-(1/2)+(1/2)-(1/3)+..........-(1/99)+(1/99)-(1/100)=1-1/100=99/100

回答2:

1/99×100=(100-99)/99×100=1/99 - 1/100
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)+……+(1/98-1/99)+(1/99-1/100)
=1-1/100
=99/100

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回答3:

1/(1×2)+1/(2×3)+...+1/(99×100)
=1-1/2+1/2-1/3+...+1/99-1/100
=1-1/100
=99/100

回答4:

=1-1/2+1/2-1/3+1/3-1/4+。。。1/99-1/100
=1-1/100
=99/100

回答5:

裂相
1/n(n+1) = 1/n - 1/(n+1)