а) $\frac{7}{12} - \frac{5}{12}$;
б) $\frac{9}{10} + \frac{3}{10}$;
в) $\frac{1}{18} + \frac{11}{18}$;
г) $\frac{11}{15} - \frac{2}{15}$.
$\frac{7}{12} - \frac{5}{12} = \frac{7 - 5}{12} = \frac{2}{12} = \frac{1}{6}$
$\frac{9}{10} + \frac{3}{10} = \frac{9 + 3}{10} = \frac{12}{10} = \frac{6}{5} = 1\frac{1}{5}$
$\frac{1}{18} + \frac{11}{18} = \frac{1 + 11}{18} = \frac{12}{18} = \frac{2}{3}$
$\frac{11}{15} - \frac{2}{15} = \frac{11 - 2}{15} = \frac{9}{15} = \frac{3}{5}$
Пожауйста, оцените решение
