17: =3-5/6=13/6
23: \(=\dfrac{2}{3}+\dfrac{4}{3}-\dfrac{5}{18}\cdot9=2-\dfrac{5}{2}=-\dfrac{1}{2}\)
24: \(=\dfrac{7-6}{8}\cdot\dfrac{4}{3}-\dfrac{2}{7}\cdot\dfrac{7}{2}\cdot\dfrac{7}{2}\)
\(=\dfrac{1}{6}-\dfrac{7}{2}=\dfrac{1}{6}-\dfrac{21}{6}=\dfrac{-20}{6}=-\dfrac{10}{3}\)