Вычислите: 1) 5/6 + 2/7; 2) 11/25 - 3/10; 3) 15/16 - 3/4; 4) 3/20 + 7/15; 5) 13/16 - 7/12; 6) 9/14 + 5/21; 7) 16/35 - 5/14; 8) 2/5 + 1/3 - 7/30; 9) 3/4 - 2/9 + 5/36.

Давай разберем примеры из упражнения 47 на сложение и вычитание дробей: 1) $\frac{5}{6} + \frac{2}{7} = \frac{35}{42} + \frac{12}{42} = \frac{47}{42} = 1\frac{5}{42}$ 2) $\frac{11}{25} - \frac{3}{10} = \frac{22}{50} - \frac{15}{50} = \frac{7}{50}$ 3) $\frac{15}{16} - \frac{3}{4} = \frac{15}{16} - \frac{12}{16} = \frac{3}{16}$ 4) $\frac{3}{20} + \frac{7}{15} = \frac{9}{60} + \frac{28}{60} = \frac{37}{60}$ 5) $\frac{13}{16} - \frac{7}{12} = \frac{39}{48} - \frac{28}{48} = \frac{11}{48}$ 6) $\frac{9}{14} + \frac{5}{21} = \frac{27}{42} + \frac{10}{42} = \frac{37}{42}$ 7) $\frac{16}{35} - \frac{5}{14} = \frac{32}{70} - \frac{25}{70} = \frac{7}{70} = \frac{1}{10}$ 8) $\frac{2}{5} + \frac{1}{3} - \frac{7}{30} = \frac{12}{30} + \frac{10}{30} - \frac{7}{30} = \frac{15}{30} = \frac{1}{2}$ 9) $\frac{3}{4} - \frac{2}{9} + \frac{5}{36} = \frac{27}{36} - \frac{8}{36} + \frac{5}{36} = \frac{24}{36} = \frac{2}{3}$