a: \(=\dfrac{7}{22}+\dfrac{15}{22}-\dfrac{15}{23}-\dfrac{8}{23}+\dfrac{2022}{2023}=\dfrac{2022}{2023}\)
b: \(=\dfrac{-2}{11}+\dfrac{35}{6}\cdot3:\dfrac{11}{2}\)
\(=\dfrac{-2}{11}+\dfrac{2}{11}\cdot\dfrac{35}{2}\)
=-2/11(1-35/2)
=-2/11*(-33/2)
=2/11*33/2
=3
c: \(=\dfrac{-2}{7}\left(3+\dfrac{5}{8}-2-\dfrac{5}{8}\right)=\dfrac{-2}{7}\)