Cho S=1/1.3+1/3.5+1/5.7+...+1/99.100. Khi đó 2S+1/101
Cho S = 1/1.3 + 1/3.5 +1/5.7 + ......+ 1/99.101. Khi đó 2S + 1/101 = ?
Cho \(S=\frac{1}{1.3}+\frac{1}{3.5}+\frac{1}{5.7}+.......+\frac{1}{99.101}\)
Khi đó \(2S+\frac{1}{101}=..............\)
Giúp mk nha
Cho \(S\) = \(\frac{1}{1.3}+\frac{1}{3.5}+\frac{1}{5.7}+...+\frac{1}{99.101}\)
Khi đó \(2S+\frac{1}{101}=\)
Cho S = 1/1.3+1/3.5+1/5.7+...+1/99.101 . Khi đó 2S+1/101=?
Tính tổng
a. 1/1.2 + 1/2.3 + 1/3.4 + ...+ 1/2015.2016
b. 2/1.3 + 2/3.5 + 2/5.7 + ...+ 2/99.101
c. 5/1.3 + 5/3.5 + 5/5.7 + ...+ 5/99.101
d. 1/2 + 1/6 + 1/12 + 1/20 + ...+ 1/9900
bn nào trả lời nhanh mik tích, cảm ơn ạ
Tính: S= 1/1.3 + 1/3.5 +1/5.7 + .....+ 1/2017.2019
S=1/1.3+1/3.5+1/5.7+....+1/19.21+1/21
Tính tổng S=1/1.3+1/3.5+1/5.7+...+1/2017.2019
