1+2.( 1/2-1/3+1/3-1/4+....+1/(x-1)-1/x+1)=3/2
1+2.(1/2-1/x+1)=3/2
1-2/x+1=3/2-1
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Các câu hỏi tương tự
(1- 2/2.3) x (1- 2/3.4) x (1- 2/4.5) x...x (1- 2/98.99)
Giúp mình với
\(x-\dfrac{1}{2}-\dfrac{1}{2.3}-\dfrac{1}{3.4}-\dfrac{1}{4.5}-...-\dfrac{1}{2021.2022}-\dfrac{1}{2022.2023}=\dfrac{-2024}{2023}\)
Tìm X biết 2/2.3 + 2/3.4 + 2/4.5+...... +2/X(X+1) = 2007/2009
TÌM x THUỘC N:2/2.3+2/3.4+2/4.5+....+2/x.(x+1)=1999/2001
tìm x:1/2.3+1/3.4+1/4.5+...+1/x.(x+1)=16/51
tìm x
1/2.1+1/2.3+1/3.4+1/4.5+.....+1/x(x+1)
tìm x
1/2.3+1/3.4+1/4.5+......+1/x.(x+1)=299/60000
giúp mìn với 1/1.2 +1/2.3+1/3.4+1/4.5+....+1/[x-1].x+1/x.[x+1]
a, 1/2+1/2.3+1/3.4+1/4.5+.....+1/49.50