Вычисли значение выражения a) 12 1/3 - 11 1/4 + 14 - 9/15

Решаю по порядку примеры на вычисление: a) $12\frac{1}{3} - 11\frac{1}{4} + 14 - \frac{8}{15} = \frac{37}{3} - \frac{45}{4} + \frac{202}{15} = \frac{37*20 - 45*15 + 202*4}{60} = \frac{740 - 675 + 808}{60} = \frac{873}{60} = \frac{291}{20} = 14\frac{11}{20}$ б) $(15 - 12\frac{5}{8}) - (13\frac{1}{2} - 11\frac{2}{9}) = (15 - \frac{101}{8}) - (\frac{27}{2} - \frac{101}{9}) = (\frac{120 - 101}{8}) - (\frac{243 - 202}{18}) = \frac{19}{8} - \frac{41}{18} = \frac{19*9 - 41*4}{72} = \frac{171 - 164}{72} = \frac{7}{72}$ в) $(14\frac{2}{3} - 5\frac{5}{6}) - (3\frac{3}{7} + 4\frac{4}{5}) + (10\frac{3}{4} - 4\frac{6}{11}) = (\frac{44}{3} - \frac{35}{6}) - (\frac{24}{7} + \frac{24}{5}) + (\frac{43}{4} - \frac{50}{11}) = (\frac{88 - 35}{6}) - (\frac{120 + 168}{35}) + (\frac{473 - 200}{44}) = \frac{53}{6} - \frac{288}{35} + \frac{273}{44} = \frac{53*35*22 - 288*6*22 + 273*6*35}{6*35*22} = \frac{40810 - 38016 + 57330}{4620} = \frac{60124}{4620} = \frac{15031}{1155} = 13\frac{2}{1155}$ г) $(14\frac{5}{7} - 14) + (30 - 29\frac{1}{5}) + (\frac{31}{33} - \frac{18}{22}) = (\frac{103}{7} - 14) + (30 - \frac{146}{5}) + (\frac{31}{33} - \frac{9}{11}) = (\frac{103 - 98}{7}) + (\frac{150 - 146}{5}) + (\frac{31 - 27}{33}) = \frac{5}{7} + \frac{4}{5} + \frac{4}{33} = \frac{5*5*33 + 4*7*33 + 4*7*5}{7*5*33} = \frac{825 + 924 + 140}{1155} = \frac{1889}{1155} = 1\frac{734}{1155}$