\( \frac{3}{5}+\frac{2}{8} \)

Step 1 ：\( \text{lcm}(5, 8) = 40 \)

Step 2 ：\( \frac{3}{5}+\frac{2}{8} = \frac{3 \times 8}{40}+\frac{2 \times 5}{40} \)

Step 3 ：\( \frac{24}{40}+\frac{10}{40} = \frac{34}{40} \)