Выполните действия:
а) $\frac{2}{9} + \frac{3}{7}$;
б) $\frac{7}{8} + \frac{3}{4}$;
в) $\frac{5}{24} + \frac{25}{36}$;
г) $\frac{59}{60} + \frac{39}{40}$;
д) $3\frac{1}{8} + 2\frac{1}{7}$;
е) $5\frac{1}{6} + 1\frac{2}{3}$.
$\frac{2}{9} + \frac{3}{7} = \frac{2 * 7 + 3 * 9}{63} = \frac{14 + 27}{63} = \frac{41}{63}$
$\frac{7}{8} + \frac{3}{4} = \frac{7 + 3 * 2}{8} = \frac{7 + 6}{8} = \frac{13}{8} = 1\frac{5}{8}$
$\frac{5}{24} + \frac{25}{36} = \frac{5 * 3 + 25 * 2}{72} = \frac{15 + 50}{72} = \frac{65}{75}$
$\frac{59}{60} + \frac{39}{40} = \frac{59 * 2 + 39 * 3}{120} = \frac{118 + 117}{120} = \frac{235}{120} = 1\frac{115}{120} = 1\frac{23}{24}$
$3\frac{1}{8} + 2\frac{1}{7} = 5 + \frac{7 + 8}{56} = 5\frac{15}{56}$
$5\frac{1}{6} + 1\frac{2}{3} = 6 + \frac{1 + 2 * 2}{6} = 6 + \frac{1 + 4}{6} = 6\frac{5}{6}$
Пожауйста, оцените решение