Question

Tính

a. \(\dfrac{5}{9}\) : \(\dfrac{7}{3}\)

b. \(\dfrac{2}{7}\) : \(\dfrac{8}{5}\)

c. \(\dfrac{4}{15}\) : \(\dfrac{2}{5}\)

d. \(\dfrac{7}{9}\) : \(\dfrac{21}{9}\)

Answer 1

a) \(\dfrac{5}{9}:\dfrac{7}{3}\)

\(=\dfrac{5}{9}\cdot\dfrac{3}{7}\)

\(=\dfrac{5}{21}\)

b) \(\dfrac{2}{7}:\dfrac{8}{5}\)

\(=\dfrac{2}{7}\cdot\dfrac{5}{8}\)

\(=\dfrac{5}{28}\) 

c) \(\dfrac{4}{15}:\dfrac{2}{5}\)

\(=\dfrac{4}{15}\cdot\dfrac{5}{2}\)

\(=\dfrac{2}{3}\)

d) \(\dfrac{7}{9}:\dfrac{21}{9}\)

\(=\dfrac{7}{9}\cdot\dfrac{9}{21}\)

\(=\dfrac{1}{3}\)