Question

Answer 1

e: \(=\dfrac{3}{7}\cdot\dfrac{13}{8}-\dfrac{3}{7}\cdot\dfrac{7}{9}-\dfrac{5}{8}\cdot\dfrac{3}{7}+\dfrac{5}{8}\cdot\dfrac{8}{15}\)

\(=\dfrac{3}{7}\left(\dfrac{13}{8}-\dfrac{5}{8}\right)-\dfrac{3}{9}+\dfrac{5}{15}\)

=3/7*1

=3/7

f: \(=1-\dfrac{13}{9}\cdot\dfrac{19}{8}+\dfrac{-11}{9}\cdot\dfrac{19}{8}\)

\(=1+\dfrac{19}{8}\left(-\dfrac{13}{9}-\dfrac{11}{9}\right)\)

\(=1+\dfrac{19}{8}\cdot\dfrac{-8}{3}=1-\dfrac{19}{3}=-\dfrac{16}{3}\)