\(\frac{3}{10}+\frac{5}{10}+...+\frac{2017}{10}\)
=\(\frac{3+5+7+...+2017}{10}\)
=\((2017+3)\cdot\left[\right](2017-3):2+1\left[\right]\)
=\(\frac{1018080}{10}\)
=101808
\(\frac{3}{10}+\frac{5}{10}+\frac{7}{10}+...+\frac{2017}{10}\)
\(=\frac{3+5+...+2017}{10}\)
số sô hạng là
\(\left(2017-3\right):2+1=1008\)
tổng là
\(\left(2017+3\right).1008:2=1018080\)
thế vào\(=\frac{1018080}{10}=101808\)
\(\frac{3}{10}+\frac{5}{10}+.....+\frac{2017}{10}\)
\(=\frac{3+5+7+...+2017}{10}\)
\(=\frac{\left[\left(2017+3\right).\left(2017-3\right):2+1\right]:2}{10}\)
\(=\frac{2040200}{10}=204020\)
\(\frac{3}{10}+\frac{5}{10}+\frac{7}{10}+...+\frac{2017}{10}\)
\(=\frac{3+5+7+...+2017}{10}\)
\(=\frac{1018080}{10}\)
\(=101808\)
