1 3 / 2 4 =

\( \frac{1}{2} : \frac{3}{4} = \frac{1}{2} \times \frac{4}{3} = \frac{1 \times 4}{2 \times 3} = \frac{4}{6} = \frac{2}{3} \)

Ответ: \( \frac{2}{3} \)