Ответ:

  1. а) \(1-\frac{5}{9}=\frac{4}{9}\).
  2. б) \(4\frac{4}{15}-2\frac{9}{40}=2+\left(\frac{32}{120}-\frac{27}{120}\right)=2\frac{1}{24}\).
  3. в) \(5-1\frac{4}{5}=3\frac{1}{5}\).
  4. г) \(6\frac{7}{15}-3\frac{9}{10}=2+\left(\frac{14}{30}+1-\frac{27}{30}\right)=2\frac{17}{30}\).
  5. д) \(5\frac{1}{20}-2\frac{1}{12}=2+\left(\frac{3}{60}+1-\frac{5}{60}\right)=2\frac{29}{30}\).
  6. е) \(4\frac{1}{26}-3\frac{8}{39}=\frac{3}{78}+1-\frac{16}{78}=\frac{65}{78}=\frac{5}{6}\).