г) \(\left(23\frac{5}{6}-50\right):(54,3-70)\)

\[23\frac{5}{6}-50=\frac{143}{6}-\frac{300}{6}=-\frac{157}{6}\]

\[54,3-70=-15,7=-\frac{157}{10}\]

\[\left(-\frac{157}{6}\right):\left(-\frac{157}{10}\right)=\left(-\frac{157}{6}\right)\cdot\left(-\frac{10}{157}\right)=\frac{10}{6}=\frac{5}{3}\]

Ответ: \(\frac{5}{3}\).