\(1+\frac{1}{2}\left(1+2\right)+\frac{1}{3}\left(1+2+3\right)+...+\frac{1}{2015}\left(1+2+3+...+2015\right)\)
\(=1+\frac{1}{2}.2.3:2+\frac{1}{3}.3.4:2+...+\frac{1}{2015}.2015.2016:2\)
\(=1+\frac{3}{2}+\frac{4}{2}+...+\frac{2016}{2}=\frac{2+3+4+...+2016}{2}=\frac{2033135}{2}\)
Tính S = 1/2(1+2) + 1/3(1+2+3)+...+ 1/2015(1+2+...+2014+2015) + 1/2016(1+2+...+2015+2016)
Tính tổng S= 2015 + 2015/1+2 + 2015/1+2+3 + ... + 2015/1+2+3+...+2016
Tính tổng S=2015+2015/1+2+2015/1+2+3+..........+2015/1+2+3+........+2016
tìm s
Tính S = 1/2(1+2) + 1/3(1+2+3)+...+ 1/2015(1+2+...+2014+2015) + 1/2016(1+2+...+2015+2016
Tính C= 1+1/2(1+2)+1/3(1+2+3)+........+1/2015(1+2+3+4+...+2015)
Tính
1+1/2×(1+2)+1/3×(1+2+3)+….+1/2015×(1+2+…+2015)
Tính tổng S = \(2015+\frac{2015}{1+2}+\frac{2015}{1+2+3}+...+\frac{2015}{1+2+3+...+2016}\)
Tính tổng:
\(S=2015+\frac{2015}{1+2}+\frac{2015}{1+2+3}+....+\frac{2015}{1+2+3+...+2016}\)
Tinh:
S=2015 + 2015/1+2 +2015/1+2+3 + 2015/1+2+3+4 +... + 2015/1+2+3+...+2016
