根据(1)式结果计算:1⼀1×2+1⼀2×3+1⼀3×4+…+1⼀2012×2013=?

2024-12-17 19:17:02
推荐回答(3个)
回答1:

1/(1×2)+1/(2×3)+1/(3×4)+...+1/(2012×2013)
=1-1/2+1/2-1/3+1/3-1/4+...+1/2012-1/2013
=1-1/2013
=2012/2013

1/(1×2)+1/(2×3)+1/(3×4)+...+1/(2012×2013) -1
=1-1/2+1/2-1/3+1/3-1/4+...+1/2012-1/2013-1
=1-1/2013-1
=-1/2013,结果是负值。

回答2:

1/1×2+1/2×3+1/3×4+…+1/2012×2013 -1
=1-1/2+1/2-1/3+1/3-1/4+……+1/1012-1/2013-1
=﹣1/2013.

回答3:

简单啊,你通分一下看看呢