Решебник по математике 5 класс Ерина Виленкин рабочая тетрадь Часть 1, 2 Часть 2 | Страница 19

\[Стр.\ 19.\]

\[\boxed{\mathbf{2.}}\]

\[\textbf{а)}\ \frac{5}{7} + \frac{1}{7} = \frac{6}{7}\]

\[\textbf{б)}\ \frac{3}{8} + \frac{2}{8} = \frac{5}{8}\]

\[\textbf{в)}\ \frac{4}{11} + \frac{5}{11} = \frac{9}{11}\]

\[\textbf{г)}\ \frac{5}{6} - \frac{3}{6} = \frac{2}{6}\]

\[\textbf{д)}\ \frac{3}{4} - \frac{2}{4} = \frac{1}{4}\]

\[\textbf{е)}\ \frac{5}{10} - \frac{5}{10} = 0\]

\[\textbf{ж)}\ \frac{2}{3} + \frac{1}{3} = \frac{3}{3} = 1\]

\[\textbf{з)}\ \frac{8}{13} - \frac{5}{13} = \frac{3}{13}\]

\[\textbf{и)}\ \frac{9}{9} - \frac{1}{9} = \frac{8}{9}\]

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

\[\textbf{а)}\ \frac{3}{5} + \frac{2}{5} = \frac{5}{5} = 1\]

\[\textbf{б)}\ \frac{8}{10} - \frac{3}{10} = \frac{5}{10}\]

\[\textbf{в)}\ \frac{31}{100} + \frac{31}{100} = \frac{62}{100}\]

\[\textbf{г)}\ \frac{29}{30} - \frac{29}{30} = 0\]

\[\textbf{д)}\ \frac{3}{7} + \frac{4}{7} = \frac{7}{7} = 1\]

\[\textbf{е)}\ \frac{8}{11} + \frac{2}{11} = \frac{10}{11}\]

\[\textbf{ж)}\ \frac{18}{49} - \frac{11}{49} = \frac{7}{49}\]

\[\textbf{з)}\ \frac{3}{4} - \frac{2}{4} = \frac{1}{4}\]

\[\textbf{и)}\ \frac{8}{8} - \frac{3}{8} = \frac{5}{8}\]

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

\[\textbf{а)}\ \frac{2}{17} + \frac{3}{17} + \frac{9}{17} = \frac{2 + 3 + 9}{17} =\]

\[= \frac{14}{17}\]

\[\textbf{б)}\ \frac{1}{5} + \frac{3}{5} + \frac{1}{5} = \frac{1 + 3 + 1}{5} =\]

\[= \frac{5}{5} = 1\]

\[\textbf{в)}\ \frac{3}{4} + \frac{5}{11} + \frac{6}{11} + \frac{1}{4} =\]

\[= \frac{3 + 1}{4} + \frac{5 + 6}{11} = \frac{4}{4} + \frac{11}{11} =\]

\[= 1 + 1 = 2\]

\[\textbf{г)}\ \frac{3}{16} + \frac{7}{16} + \frac{5}{16} = \frac{3 + 7 + 5}{16} =\]

\[= \frac{15}{16}\]

\[\textbf{д)}\ \frac{7}{10} + \frac{1}{10} + \frac{1}{10} = \frac{9}{10}\]

\[\textbf{е)}\ \frac{14}{15} + \frac{3}{2} + \frac{16}{15} + \frac{1}{2} =\]

\[= \frac{14 + 16}{15} + \frac{3 + 1}{2} = \frac{30}{15} + \frac{4}{2} =\]

\[= 2 + 2 = 4\]