Bài 7:
a: \(=\dfrac{-8}{5}:\dfrac{5}{3}=\dfrac{-8}{5}\cdot\dfrac{3}{5}=\dfrac{-24}{25}\)
b: \(=\dfrac{1}{5}:\dfrac{1}{4}\cdot\dfrac{-56+6}{24}=\dfrac{4}{5}\cdot\dfrac{-50}{24}=\dfrac{-200}{120}=\dfrac{-5}{3}\)
Bài 6:
a: \(=\dfrac{12}{19}\cdot\dfrac{19}{12}\cdot\dfrac{-13}{17}\cdot\dfrac{17}{13}\cdot\dfrac{7}{15}=\dfrac{-7}{15}\)
b: \(=-\dfrac{2\cdot13\cdot9\cdot10}{3\cdot4\cdot5\cdot26}=-\dfrac{13}{26}\cdot\dfrac{9}{3}\cdot\dfrac{10}{4}\cdot\dfrac{2}{5}=\dfrac{-1}{2}\cdot3=-\dfrac{3}{2}\)
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