6) \(=-16\dfrac{2}{7}:\dfrac{3}{5}+28\dfrac{2}{7}:\dfrac{3}{5}\)
\(=\left(-16\dfrac{2}{7}+28\dfrac{2}{7}\right):\dfrac{3}{5}\)
\(=12.\dfrac{5}{3}=20\)
7) \(=\left(4.\dfrac{3}{4}-\dfrac{1}{2}\right).\dfrac{6}{5}-17\)
\(=\left(\dfrac{6}{2}-\dfrac{1}{2}\right).\dfrac{6}{5}-17\)
\(=\dfrac{5}{2}.\dfrac{6}{5}-17\)
\(=3-17=-14\)
9) \(=\dfrac{3}{5}:\dfrac{-7}{30}+\dfrac{3}{5}:\dfrac{-7}{5}\)
\(=\dfrac{3}{5}.\dfrac{-30}{7}+\dfrac{3}{5}.\dfrac{-5}{7}\)
\(=\dfrac{3}{5}.\left(\dfrac{-30}{7}-\dfrac{5}{7}\right)\)
\(=\dfrac{3}{5}.\left(-5\right)=-3\)
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