CMR : $frac{1}{4}$<$frac{1}{5}$+$frac{2}{5^2}$+$frac{3}{5^3}$+.....+$frac{2020}{5^2020}$<$frac{1}{3}$

2025-01-28 01:55:22

CMR : $\frac{1}{4}$<$\frac{1}{5}$+$\frac{2}{5^2}$+$\frac{3}{5^3}$+.....+$\frac{2020}{5^2020}$<$\frac{1}{3}$

Đăng phản hồi