29. Выполните сложение или вычитание:

Решение:

* \(\frac{7}{12} + \frac{3}{12} = \frac{7+3}{12} = \frac{10}{12} = \frac{5}{6}\)
* \(\frac{3}{7} + \frac{2}{7} = \frac{3+2}{7} = \frac{5}{7}\)
* \(\frac{13}{55} - \frac{5}{55} = \frac{13-5}{55} = \frac{8}{55}\)
* \(\frac{11}{18} - \frac{7}{18} = \frac{11-7}{18} = \frac{4}{18} = \frac{2}{9}\)
* \(\frac{7}{10} + \frac{1}{10} = \frac{7+1}{10} = \frac{8}{10} = \frac{4}{5}\)
* \(\frac{4}{5} - \frac{3}{5} = \frac{4-3}{5} = \frac{1}{5}\)
* \(\frac{4}{11} + \frac{6}{11} = \frac{4+6}{11} = \frac{10}{11}\)
* \(\frac{7}{8} - \frac{5}{8} = \frac{7-5}{8} = \frac{2}{8} = \frac{1}{4}\)
* \(\frac{76}{100} - \frac{67}{100} = \frac{76-67}{100} = \frac{9}{100}\)
* \(\frac{8}{13} - \frac{7}{13} = \frac{8-7}{13} = \frac{1}{13}\)
* \(7 + \frac{1}{5} = \frac{7 \cdot 5}{5} + \frac{1}{5} = \frac{35}{5} + \frac{1}{5} = \frac{36}{5}\) или \(7 \frac{1}{5}\)
* \(3 - \frac{4}{7} = \frac{3 \cdot 7}{7} - \frac{4}{7} = \frac{21}{7} - \frac{4}{7} = \frac{17}{7}\)
* \(1 - \frac{6}{11} = \frac{1 \cdot 11}{11} - \frac{6}{11} = \frac{11}{11} - \frac{6}{11} = \frac{5}{11}\)
* \(1 + \frac{3}{7} = \frac{1 \cdot 7}{7} + \frac{3}{7} = \frac{7}{7} + \frac{3}{7} = \frac{10}{7}\)
* \(8 \frac{2}{5} + 3 = 8 + 3 + \frac{2}{5} = 11 + \frac{2}{5} = 11 \frac{2}{5}\) или \(\frac{11 \cdot 5 + 2}{5} = \frac{55+2}{5} = \frac{57}{5}\)