\[\boxed{\text{5.\ 36}}\]
\[\textbf{а)}\ \frac{44}{18}s \cdot \left( - \frac{9}{11}n \right) = - 2sn \rightarrow - 2\]
\[\textbf{б)} - 1\frac{2}{5}a \cdot \left( - 1\frac{3}{7} \right) = \frac{7}{5} \cdot \frac{10}{7} \cdot a =\]
\[= 2a \rightarrow 2\]
\[\textbf{в)}\ \frac{2}{5}z \cdot \left( - \frac{5}{6}x \right) \cdot \left( - \frac{5}{6} \right) =\]
\[= \frac{2}{5}z \cdot \frac{25}{36}x = \frac{5}{18}\text{xz} \rightarrow \frac{5}{18}\]
\[\textbf{г)} - 1\frac{3}{7} \cdot ( - n) \cdot \left( - 2\frac{1}{3} \right) =\]
\[= - \frac{10}{7} \cdot \frac{7}{3} \cdot n = - \frac{10}{3}n =\]
\[= - 3\frac{1}{3}n \rightarrow - 3\frac{1}{3}\]