Sau khi thực hiện các phép tính: \(\dfrac{5}{8}.\dfrac{8}{17}-\dfrac{5}{8}.\dfrac{19}{17}+\dfrac{5}{8}.\dfrac{-6}{17}\) , ta có kết quả là
\(-\dfrac{5}{8}\). \(-\dfrac{1}{2}\). \(\dfrac{5}{8}\). \(-\dfrac{7}{8}\). Hướng dẫn giải:\(\dfrac{5}{8}.\dfrac{8}{17}-\dfrac{5}{8}.\dfrac{19}{17}+\dfrac{5}{8}.\dfrac{-6}{17}\)
\(=\dfrac{5}{8}.\left(\dfrac{8}{17}-\dfrac{19}{17}+\dfrac{-6}{17}\right)\)
\(=\dfrac{5}{8}.\dfrac{8+\left(-19\right)+\left(-6\right)}{17}\)
\(=\dfrac{5}{8}.\dfrac{-17}{17}=-\dfrac{5}{8}\)