Question

Answer 1

\(a,\dfrac{2}{3}-\dfrac{5}{7}.\dfrac{14}{25}=\dfrac{2}{3}-\dfrac{2}{5}=\dfrac{10}{15}-\dfrac{6}{15}=\dfrac{4}{15}\\ b,\dfrac{-5}{8}\left(\dfrac{4}{9}+\dfrac{-7}{12}\right)\\ =\dfrac{-5}{8}\left(\dfrac{16}{36}-\dfrac{21}{36}\right)\\ =\dfrac{-5}{8}.\dfrac{-5}{6}=\dfrac{25}{48}\)