\[\boxed{\text{4.\ 324}}\]
\[\textbf{а)} - 23 \cdot 5 = - 115\]
\[\textbf{б)}\ - \frac{4}{7} \cdot \left( - \frac{1}{2} \right) = \frac{4}{7} \cdot \frac{1}{2} = \frac{2}{7}\]
\[\textbf{в)}\ 3\frac{2}{3} \cdot \left( - \frac{4}{11} \right) = - \frac{11}{3} \cdot \frac{4}{11} =\]
\[= - \frac{4}{3} = - 1\frac{1}{3}\]
\[\textbf{г)} - 0,6 \cdot 0,2 = - 0,12\]
\[\textbf{д)}\ \left( - \frac{1}{3} \right)^{2} = \frac{1}{9}\]
\[\textbf{е)}\ ( - 2)^{3} = - 8\]
\[\textbf{ж)} - 2,4 \cdot ( - 5) = 12\]
\[\textbf{з)}\ \left( \frac{1}{5} - \frac{3}{4} \right) \cdot ( - 4) =\]
\[= \left( \frac{4}{20} - \frac{15}{20} \right) \cdot ( - 4) =\]
\[= - \frac{11}{20} \cdot ( - 4) = \frac{11}{5} = 2,2\]