Câu trả lời:

\(\dfrac{-2}{5}.\dfrac{5}{8}+\)\(\dfrac{5}{8}.\dfrac{3}{5}\)

= \(\dfrac{5}{8}.\left(\dfrac{-2}{5}+\dfrac{3}{5}\right)\)

\(=\dfrac{5}{8}.\dfrac{1}{5}\)

\(=\dfrac{5}{40}=\dfrac{1}{8}\)