\(\dfrac{1}{1\times2}+\dfrac{1}{2\times3}+\dfrac{1}{3\times4}+....+\dfrac{1}{24\times25}\)
\(=1-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+...+\dfrac{1}{24}-\dfrac{1}{25}\)
\(=1-\dfrac{1}{25}\)
\(=\dfrac{24}{25}\)
1/1x2 + 1/2x3 +1/3x4 +1/4x5 +1/5x6
1/1x2+1/2x3+1/3x4+...+1/99x100=?
1/1x2 + 1/2x3 + 1/3x4 + ............. + 1/2009x2010
Tính:1/1x2 + 1/2x3 + 1/3x4 + ... + 1/98x99 + 1/99x100
1/1x2+1/2x3+1/3x4+...+1/2023x2024 ?
TRẢ LỜI NHANH . HELP ME
1/1x2 +1/2x3 +1/3x4 + 1/4x5 + ... + 1/2016 x 2017
Tính:1/(1x2)+1/(2x3)+1/(3x4)+1/(4x5)+...+1/(98x99)+1/(99x100)
Tính
D = \(\dfrac{1}{1x2}+\dfrac{1}{2x3}+\dfrac{1}{3x4}+....+\dfrac{1}{2022x2023}\)
1/1x2+1/2x3+1/3x4+1/4x5+...+1/X nhân ( X + 1 ) = 2017/2018 làm ơn đó
