Ответ:

\(-5\frac1{16}+1\frac18=-\frac{81}{16}+\frac{18}{16}=-\frac{63}{16}\).

\(-\frac56-\frac34=-\frac{10}{12}-\frac9{12}=-\frac{19}{12}\).

\(-\frac{63}{16}\cdot-\frac{19}{12}=\frac{399}{64}=6\frac{15}{64}\).

Ответ: \(6\frac{15}{64}\).