Thực hiện phép tính: 4/3 + -11/31+ 3/10 - 20/31 - 2/5

\(\frac{4}{3}+\frac{-11}{31}+\frac{3}{10}-\frac{20}{31}-\frac{2}{5}\)

\(=\frac{4}{3}+\left(\frac{-11}{31}-\frac{20}{31}\right)+\frac{3}{10}-\frac{2}{5}\)

\(=\frac{4}{3}+\left(-1\right)+\frac{-1}{10}\)

\(=\frac{1}{3}+\frac{-1}{10}=\frac{7}{30}\)

4/3 + -11/31+ 3/10 - 20/31 - 2/5

= 4/3 + 3/10 - 2/5 + (-11/31 -20/31)

= 49/30 - 2/5 - 1

= 37/30 - 1

= 7/30

4/3 + -11/31+ 3/10 - 20/31 - 2/5 = 7/30