Question

thực hiện phép tính (tính nhanh nếu có thể)

Answer 1

i) \(\dfrac{1}{2}+\dfrac{-3}{8}+\dfrac{5}{9}\)

\(=\dfrac{1}{8}+\dfrac{5}{9}\)

\(=\dfrac{49}{72}\)

k)\(\dfrac{13}{-30}+\dfrac{17}{45}+\dfrac{-7}{18}\)

\(=\dfrac{-1}{18}+\dfrac{-7}{18}\)

\(=\dfrac{-4}{9}\)

m) \(\dfrac{-5}{12}+\dfrac{4}{9}+\dfrac{-11}{6}\)

\(=\dfrac{1}{36}+\dfrac{-11}{6}\)

\(=\dfrac{-65}{36}\)

n) \(\dfrac{-7}{31}+\dfrac{24}{17}+\dfrac{7}{31}\)

\(=\left(\dfrac{-7}{31}+\dfrac{7}{31}\right)+\dfrac{24}{17}\)

\(=0+\dfrac{24}{17}\)

\(\dfrac{24}{17}\)