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21 tháng 6 2021 lúc 15:07
\(\dfrac{2}{3.5}+\)\(\dfrac{2}{5.7}+\dfrac{2}{7.9}\)\(+...+\dfrac{2}{2015.2017}\)
2/1.3 + 2/3.5 + 2/5.7 + ... + 2/2015.2017
tính tổng S=2/1.3+2/3.5+2/5.7+2/7.9+2/9.11
Cho A =2/1.3+2/3.5+2/5.7+2/7.9+....2/97.99
\(\dfrac{2}{1.3}\) + \(\dfrac{2}{3.5}\) + \(\dfrac{2}{5.7}\) + \(\dfrac{2}{7.9}\) + ... + \(\dfrac{2}{2020.2022}\)
( 1/1.3+1/3.5+1/5.7+1/7.9+1/9.11). X = 2/3
2/1.3+2/3.5+2/5.7+2/7.9+...+2/2020.2022 trả lời đúng và rõ ràng hộ mink nhé!
tìm n để 2/1.3+2/3.5+2/5.7+2/7.9+...+2/n.(n+2)<2003/2004
2^2/1.3+2^2/3.5+2^2/5.7+2^2/7.9+2^2/9.11
lam dc se dc like