\[Страница\ 78.\]
\[\boxed{\mathbf{5.}}\]
\[\textbf{а)}\ \left( 7\frac{1}{2} + 3\frac{2}{3} \right) \cdot 6 =\]
\[= \frac{15}{2} \cdot 6 + \frac{11}{3} \cdot 6 = 45 + 22 = 67\]
\[\textbf{б)}\ \left( 9 - 1\frac{1}{7} \right) \cdot 7 = 9 \cdot 7 - \frac{8}{7} \cdot 7 =\]
\[= 63 - 8 = 55\]
\[\textbf{в)}\ \left( 6 + 1\frac{1}{3} \cdot 2 \right) \cdot 30 =\]
\[= 6 \cdot 30 + \frac{8}{3} \cdot 30 = 180 + 80 =\]
\[= 260\]
\[\textbf{г)}\ 7\frac{7}{11} \cdot 3\frac{2}{5} + 7\frac{7}{11} \cdot 7\frac{3}{5} =\]
\[= 7\frac{7}{11} \cdot \left( 3\frac{2}{5} + 7\frac{3}{5} \right) = \frac{84}{11} \cdot 11 =\]
\[= 84\]
\[\textbf{д)}\ 5\frac{3}{4} \cdot 3\frac{5}{7} + 3\frac{5}{7} \cdot 1\frac{1}{4} =\]
\[= 3\frac{5}{7} \cdot \left( 5\frac{3}{4} + 1\frac{1}{4} \right) = \frac{26}{7} \cdot 7 = 26\]
\[\textbf{е)}\ 8\frac{3}{5} \cdot 6\frac{1}{7} - 1\frac{1}{7} \cdot 8\frac{3}{5} =\]
\[= 8\frac{3}{5} \cdot \left( 6\frac{1}{7} - 1\frac{1}{7} \right) = \frac{43}{5} \cdot 5 = 43\]
\[\textbf{ж)}\ 15\frac{3}{8} \cdot 4\frac{1}{6} - 4\frac{1}{6} \cdot 15\frac{3}{8} = 0\]
\[\textbf{з)}\ 10\frac{5}{11} \cdot 4\frac{1}{3} + 10\frac{5}{11} \cdot 6\frac{2}{3} =\]
\[= 10\frac{5}{11} \cdot \left( 4\frac{1}{3} + 6\frac{2}{3} \right) =\]
\[= \frac{115}{11} \cdot 11 = 115\]
\[\boxed{\mathbf{6.}}\]
\[Ответ:250.\]
\[= 0,01 + 0,99 = 1\]
\[Ответ:1.\]