Выполни действия с дробями: a) $5\frac{1}{7} + \frac{1}{7}$

a) $5\frac{1}{7} + \frac{1}{7} = 5\frac{2}{7}$ б) $3\frac{1}{7} + \frac{2}{7} = 3\frac{3}{7}$ в) $3\frac{5}{6} + \frac{5}{6} = 3 + \frac{10}{6} = 3 + 1\frac{4}{6} = 4\frac{4}{6} = 4\frac{2}{3}$ г) $9 - \frac{8}{5} = 9 - 1\frac{3}{5} = 7\frac{5}{5} - \frac{3}{5} = 7\frac{2}{5}$ Проверка сложением: $7\frac{2}{5} + 1\frac{3}{5} = 8\frac{5}{5} = 9$ д) $5\frac{1}{12} + 6 = 11\frac{1}{12}$ е) $5\frac{3}{15} - \frac{4}{15} = 5\frac{3}{15} - \frac{4}{15} = 4\frac{18}{15} - \frac{4}{15} = 4\frac{14}{15}$ Проверка сложением: $4\frac{14}{15} + \frac{4}{15} = 4\frac{18}{15} = 5\frac{3}{15}$ ж) $\frac{19}{21} - \frac{11}{15} = \frac{19 \cdot 5}{21 \cdot 5} - \frac{11 \cdot 7}{15 \cdot 7} = \frac{95}{105} - \frac{77}{105} = \frac{18}{105} = \frac{6}{35}$ и) $\frac{11}{21} + \frac{2}{26} = \frac{11}{21} + \frac{1}{13} = \frac{11 \cdot 13}{21 \cdot 13} + \frac{1 \cdot 21}{13 \cdot 21} = \frac{143}{273} + \frac{21}{273} = \frac{164}{273}$ з) $\frac{5}{42} + \frac{10}{63} = \frac{5 \cdot 3}{42 \cdot 3} + \frac{10 \cdot 2}{63 \cdot 2} = \frac{15}{126} + \frac{20}{126} = \frac{35}{126} = \frac{5}{18}$ к) $\frac{5}{24} - \frac{7}{60} = \frac{5 \cdot 5}{24 \cdot 5} - \frac{7 \cdot 2}{60 \cdot 2} = \frac{25}{120} - \frac{14}{120} = \frac{11}{120}$