\[\boxed{\mathbf{Проверочная\ работа\ №4.\ Вычитание\ смешанных\ чисел}}\]
\[\boxed{\mathbf{1.}}\]
\[\frac{17}{51} = \frac{1 \cdot 17}{3 \cdot 17} = \frac{1}{3}.\]
\[\boxed{\mathbf{2.}}\]
\[\frac{41}{12} = 3\frac{5}{12}.\]
\[\boxed{\mathbf{3.}}\]
\[1\frac{4}{15} = \frac{15 \cdot 1 + 4}{15} = \frac{19}{15}.\]
\[\boxed{\mathbf{4.}}\]
\[8\frac{6}{7} - 5 = 3\frac{6}{7}.\]
\[\boxed{\mathbf{5.}}\]
\[10 - \frac{7}{8} = 9\frac{8}{8} - \frac{7}{8} = 9\frac{1}{8}.\]
\[\boxed{\mathbf{6.}}\]
\[4\frac{1}{3} - \frac{1}{6} = 4\frac{2}{6} - \frac{1}{6} = 4\frac{1}{6}.\]
\[\boxed{\mathbf{7.}}\]
\[2\frac{2}{5} - y = 1\frac{4}{5}\]
\[y = 2\frac{2}{5} - 1\frac{4}{5} = 1\frac{7}{5} - 1\frac{4}{5}\]
\[y = \frac{3}{5}.\]
\[\mathbf{Да.}\]
\[\boxed{\mathbf{8.}}\]
\[5\frac{3^{\backslash 7}}{8} - 4\frac{3^{\backslash 8}}{7} = 5\frac{21}{56} - 4\frac{24}{56} =\]
\[= 4\frac{77}{56} - 4\frac{24}{56} = \frac{53}{56} < 1\]
\[\mathbf{Нет.}\]