Помоги мне выполнить действия с дробями: a) 5 1/4 + 6 5/6

Привет! Давай помогу разобраться с этими примерами на дроби. а) $5 \frac{1}{4} + 6 \frac{5}{6} = 5 + \frac{1}{4} + 6 + \frac{5}{6} = (5 + 6) + (\frac{1}{4} + \frac{5}{6}) = 11 + (\frac{3}{12} + \frac{10}{12}) = 11 + \frac{13}{12} = 11 + 1 \frac{1}{12} = 12 \frac{1}{12}$ б) $3 \frac{4}{10} - 1 \frac{3}{15} = 3 + \frac{4}{10} - (1 + \frac{3}{15}) = 3 + \frac{2}{5} - 1 - \frac{1}{5} = (3 - 1) + (\frac{2}{5} - \frac{1}{5}) = 2 + \frac{1}{5} = 2 \frac{1}{5}$ д) $4 \frac{9}{8} - 3 \frac{5}{10} = 4 + \frac{9}{8} - (3 + \frac{1}{2}) = 4 + 1 \frac{1}{8} - 3 - \frac{1}{2} = (4 - 3) + (1 \frac{1}{8} - \frac{1}{2}) = 1 + (1 \frac{1}{8} - \frac{4}{8}) = 1 + \frac{9}{8} - \frac{4}{8} = 1 + \frac{5}{8} = 1 \frac{5}{8}$ г) $5 - 3 \frac{2}{7} = 5 - (3 + \frac{2}{7}) = 5 - 3 - \frac{2}{7} = 2 - \frac{2}{7} = \frac{14}{7} - \frac{2}{7} = \frac{12}{7} = 1 \frac{5}{7}$ е) $8 \frac{5}{9} : 6 \frac{8}{10} = 8 \frac{5}{9} : 6 \frac{4}{5} = \frac{77}{9} : \frac{34}{5} = \frac{77}{9} * \frac{5}{34} = \frac{77 * 5}{9 * 34} = \frac{385}{306} = 1 \frac{79}{306}$ ж) $2 \frac{6}{7} : 3 \frac{1}{3} = \frac{20}{7} : \frac{10}{3} = \frac{20}{7} * \frac{3}{10} = \frac{20 * 3}{7 * 10} = \frac{60}{70} = \frac{6}{7}$ з) $6 \frac{3}{5} * 10 = \frac{33}{5} * 10 = \frac{33 * 10}{5} = \frac{330}{5} = 66$ и) $7 \frac{8}{9} - 6 \frac{5}{6} = 7 + \frac{8}{9} - (6 + \frac{5}{6}) = 7 + \frac{8}{9} - 6 - \frac{5}{6} = (7 - 6) + (\frac{8}{9} - \frac{5}{6}) = 1 + (\frac{16}{18} - \frac{15}{18}) = 1 + \frac{1}{18} = 1 \frac{1}{18}