14 21 / 25 50 =

\( \frac{14}{25} : \frac{21}{50} = \frac{14}{25} \times \frac{50}{21} = \frac{14 \times 50}{25 \times 21} = \frac{700}{525} = \frac{4}{3} \)

Ответ: \( \frac{4}{3} \)