Tính
----- Nội dung ảnh -----
1) Tính 2 \(\frac{1}{3} + \frac{1}{7} + \frac{2}{13} + \frac{3}{5} + \frac{3}{4}\)
+ \(\frac{2}{10.5}\) + \(\frac{3}{13.4}\) + \(\frac{4}{21}\)
\( + \frac{1}{2} (1 + 2 + 3) + \frac{1}{3} (1 + 2 + 3 + 4) + ... + \frac{1}{2025} (1 + 2 + ... + 2025) \)
1) Tính 2 \(\frac{1}{3} + \frac{1}{7} + \frac{2}{13} + \frac{3}{5} + \frac{3}{4}\)
+ \(\frac{2}{10.5}\) + \(\frac{3}{13.4}\) + \(\frac{4}{21}\)
\( + \frac{1}{2} (1 + 2 + 3) + \frac{1}{3} (1 + 2 + 3 + 4) + ... + \frac{1}{2025} (1 + 2 + ... + 2025) \)