Question

giúp mik với

Answer 1

a: \(=\dfrac{5}{14}\cdot\dfrac{7}{5}\cdot\dfrac{1}{3}\cdot\dfrac{-4}{15}=\dfrac{1}{2}\cdot\dfrac{1}{3}\cdot\dfrac{-4}{15}=\dfrac{-2}{45}\)

b: \(=\dfrac{2}{19}\cdot\dfrac{6}{7}\cdot\dfrac{7}{5}\cdot\dfrac{-19}{27}\)

\(=\dfrac{6}{5}\cdot\dfrac{-2}{27}=\dfrac{-12}{135}=\dfrac{-4}{45}\)

c: \(=\dfrac{3\cdot4\cdot5\left(1-7+9-11\right)}{4\cdot5\cdot6\left(1-7+11\right)}\)

\(=\dfrac{1}{2}\cdot\dfrac{-8}{5}=\dfrac{-4}{5}\)