С) 7 2/3 · (−9/11) : 4,6 · (−2,75) : 3 3/4

Преобразуем числа: \(7\frac{2}{3}=\frac{23}{3}\), \(4.6=\frac{23}{5}\), \(-2.75=-\frac{11}{4}\), \(3\frac{3}{4}=\frac{15}{4}\).

\[\frac{23}{3}\cdot\left(-\frac{9}{11}\right):\frac{23}{5}\cdot\left(-\frac{11}{4}\right):\frac{15}{4}=\frac{5}{3}.\]

Ответ: \(\frac{5}{3}=1\frac{2}{3}\).