\[\mathbf{Страница\ 66.}\]
\[\boxed{\mathbf{8.}}\]
\[\textbf{а)}\ 7\frac{5}{8} - x = 3\frac{11}{12}\]
\[x = 7\frac{5}{8} - 3\frac{11}{12}\]
\[x = 7\frac{15}{24} - 3\frac{22}{24}\]
\[x = 6\frac{39}{24} - 3\frac{22}{24}\]
\[x = 3\frac{17}{24}.\]
\[Ответ:3\frac{17}{24}.\]
\[\textbf{б)}\ x\ :1\frac{1}{2} = 1\frac{3}{11} \cdot 1\frac{5}{6}\]
\[x\ :\frac{3}{2} = \frac{14}{11} \cdot \frac{11}{6}\]
\[x\ :\frac{3}{2} = \frac{7}{3}\]
\[x = \frac{7}{3} \cdot \frac{3}{2} = \frac{7}{2}\]
\[x = 3,5.\]
\[Ответ:3,5.\ \]
\[\boxed{\mathbf{9.}}\]
\[\boxed{\mathbf{10.}}\]
\[ответ:10\ треугольников.\]
\[\boxed{\mathbf{1.}}\]
\[\textbf{а)}\ координатной\ осью.\]
\[\textbf{б)}\ координатой.\]
\[\textbf{в)}\ положительными.\]
\[\textbf{г)}\ отрицательными.\]
\[\textbf{д)}\ 0.\]