Выполни действия с дробями: a) $1\frac{4}{15} - \frac{17}{20}$

a) $1\frac{4}{15} - \frac{17}{20} = \frac{19}{15} - \frac{17}{20} = \frac{76}{60} - \frac{51}{60} = \frac{25}{60} = \frac{5}{12}$ б) $7\frac{4}{15} - \frac{7}{9} = \frac{109}{15} - \frac{7}{9} = \frac{327}{45} - \frac{35}{45} = \frac{292}{45} = 6\frac{22}{45}$ в) $2\frac{5}{12} - \frac{7}{8} = \frac{29}{12} - \frac{7}{8} = \frac{58}{24} - \frac{21}{24} = \frac{37}{24} = 1\frac{13}{24}$ г) $11\frac{1}{2} - 3\frac{11}{18} = \frac{23}{2} - \frac{65}{18} = \frac{207}{18} - \frac{65}{18} = \frac{142}{18} = \frac{71}{9} = 7\frac{8}{9}$ д) $9\frac{2}{11} - 7\frac{5}{9} = \frac{101}{11} - \frac{68}{9} = \frac{909}{99} - \frac{748}{99} = \frac{161}{99} = 1\frac{62}{99}$ e) $2\frac{6}{25} - 1\frac{7}{10} = \frac{56}{25} - \frac{17}{10} = \frac{112}{50} - \frac{85}{50} = \frac{27}{50}$ ж) $3\frac{1}{2} - 2\frac{3}{4} = \frac{7}{2} - \frac{11}{4} = \frac{14}{4} - \frac{11}{4} = \frac{3}{4}$ з) $12\frac{5}{12} - 9\frac{13}{18} = \frac{149}{12} - \frac{175}{18} = \frac{447}{36} - \frac{350}{36} = \frac{97}{36} = 2\frac{25}{36}$