a: \(=\dfrac{11}{5}:\left(\dfrac{7}{5}-\dfrac{3}{10}\right)-\dfrac{2}{5}\)
\(=\dfrac{11}{5}:\dfrac{14-3}{10}-\dfrac{2}{5}\)
\(=\dfrac{11}{5}\cdot\dfrac{10}{11}-\dfrac{2}{5}=\dfrac{10}{5}-\dfrac{2}{5}=\dfrac{8}{5}\)
b: \(\dfrac{-15}{4}\cdot\dfrac{10}{3}-\dfrac{7}{4}-\dfrac{7}{8}\)
\(=\dfrac{-150}{12}-\dfrac{7}{4}-\dfrac{7}{8}=\dfrac{-25}{2}-\dfrac{7}{4}-\dfrac{7}{8}=\dfrac{-100}{8}-\dfrac{14}{8}-\dfrac{7}{8}=-\dfrac{121}{8}\)
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