Tính nhanh

\(\dfrac{5}{7}.\dfrac{-4}{19}+\dfrac{-15}{7}.\dfrac{5}{19}\)

Tính nhanh

\(\dfrac{-5}{7}.\dfrac{2}{11}+\dfrac{-5}{7}.\dfrac{9}{11}+1\dfrac{5}{7}\)

Tính nhanh

\(\dfrac{-4}{7}.\dfrac{2}{9}+\dfrac{-4}{7}.\dfrac{7}{9}+2\dfrac{4}{7}\)

Tính nhanh

\(A=\dfrac{4}{9}.19\dfrac{1}{4}-\dfrac{4}{9}.29\dfrac{1}{4}\)

\(\dfrac{-1}{6}+\dfrac{2}{3}.\left(-\dfrac{3}{4}\right)+\dfrac{\left(-2\right)^2}{5}\)

\(\dfrac{2}{3}-\dfrac{1}{3}\left(\dfrac{4}{9}-\dfrac{5}{6}\right):\dfrac{7}{12}\)