Question

giúp em vs ạ

Answer 1

\(=\dfrac{-2}{5}+\dfrac{-15}{5}=\dfrac{-2-15}{5}=\dfrac{-17}{5}\)

Answer 2

\(\dfrac{-2}{5}+\left(-3\right)=\dfrac{-2}{5}+\dfrac{-3}{1}=\dfrac{-2}{5}+\dfrac{-15}{5}=\dfrac{-17}{5}\)