Решебник по математике 4 класс Петерсон рабочая тетрадь Часть 1, 2, 3 Часть 2 | Страница 27

\[\boxed{Страница\ 28.}\]

\[\boxed{\mathbf{3.}}\]

\[2\frac{7}{8} + x = 3\frac{4}{8}\]

\[x = 3\frac{4}{8} - 2\frac{7}{8}\]

\[x = 2\frac{12}{8} - 2\frac{7}{8}\]

\[x = \frac{5}{8}.\]

\[4\frac{2}{7} - y = 1\frac{6}{7}\]

\[y = 4\frac{2}{7} - 1\frac{6}{7}\]

\[y = 3\frac{9}{7} - 1\frac{6}{7}\]

\[y = 2\frac{3}{7}.\]

\[n - \frac{3}{5} = 6\frac{4}{5}\]

\[n = 6\frac{4}{5} + \frac{3}{5}\]

\[n = 6\frac{7}{5}\]

\[n = 7\frac{2}{5}.\]

\[\boxed{\mathbf{4.}}\]

\[\textbf{а)}\ \frac{6}{6} = \frac{121}{121}\]

\[\textbf{б)}\ \frac{7}{8} < \frac{8}{7}\]

\[\textbf{в)}\ \frac{12}{5} = 2\frac{2}{5} < \frac{19}{6} = 3\frac{1}{6}\]