1: \(=\left[\dfrac{1}{3}\cdot\dfrac{24-45}{20}-\dfrac{7}{5}\cdot\dfrac{15+10}{14}\right]:\dfrac{1+5}{6}\)
\(=\dfrac{1}{3}\cdot\dfrac{-21}{20}-\dfrac{7}{5}\cdot\dfrac{25}{14}\)
\(=\dfrac{-7}{20}-\dfrac{5}{2}=\dfrac{-57}{20}\)
2: \(=\dfrac{1}{5}\cdot\dfrac{10}{3}+\dfrac{5}{6}\cdot\left(\dfrac{60-6}{25}+\dfrac{6}{25}\right)-\dfrac{18}{17}\cdot\dfrac{34}{9}\)
\(=\dfrac{2}{3}+\dfrac{5}{6}\cdot\dfrac{12}{5}-4\)
\(=\dfrac{2}{3}+2-4=\dfrac{2}{3}-2=-\dfrac{4}{3}\)
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