\[\boxed{\text{4.\ 301}}\]
\[= - 376 + 300 = - 76\]
\[= 9,1 \cdot ( - 2,3) = - 20,93\]
\[\textbf{в)}\ (3,2 - 6,7) \cdot ( - 4,4 + 6,1) =\]
\[= - 3,5 \cdot 1,7 = - 5,95\]
\[\textbf{г)}\ \left( - 4\frac{1}{2} + 3\frac{3}{4} \right) \cdot \left( - 9\frac{6}{7} + 8\frac{4}{7} \right) =\]
\[= \left( - 4\frac{2}{4} + 3\frac{3}{4} \right) \cdot \left( - 1\frac{2}{7} \right) =\]
\[= \left( - 3\frac{6}{4} + 3\frac{3}{4} \right) \cdot \left( - \frac{9}{7} \right) =\]
\[= - \frac{3}{4} \cdot \left( - \frac{9}{7} \right) = \frac{3}{4} \cdot \frac{9}{7} = \frac{27}{28}\]
\[\textbf{д)}\ 1\frac{1}{4} \cdot \left( - \frac{4}{5} \right) - \left( - 1\frac{7}{8} \right) \cdot 1\frac{3}{5} =\]
\[= - \frac{5}{4} \cdot \frac{4}{5} + \frac{15}{8} \cdot \frac{8}{5} = - 1 + 3 = 2\]
\[\textbf{е)}\ 1\frac{1}{4} \cdot \left( - 15,3 - 18,9 \cdot \frac{5}{7} \right) =\]
\[= \frac{5}{4} \cdot \left( - 15,3 - \frac{189}{10} \cdot \frac{5}{7} \right) =\]
\[= \frac{5}{4} \cdot \left( - 15,3 - \frac{27}{2} \right) =\]
\[= \frac{5}{4} \cdot ( - 15,3 - 13,5) =\]
\[= \frac{5}{4} \cdot ( - 28,8) = 5 \cdot ( - 7,2) =\]
\[= - 36\]