23. Вычислите: (−5 1/16 + 1 1/8) × (−5/6 − 3/4).

\[-5\frac{1}{16}+1\frac{1}{8}=-\frac{81}{16}+\frac{18}{16}=-\frac{63}{16}.\]

\[-\frac{5}{6}-\frac{3}{4}=-\frac{10}{12}-\frac{9}{12}=-\frac{19}{12}.\]

\[\left(-\frac{63}{16}\right)\left(-\frac{19}{12}\right)=\frac{63\cdot19}{16\cdot12}=\frac{399}{64}=6\frac{15}{64}.\]

Ответ: \(6\frac{15}{64}\).