Ответ:

  1. \(\frac{1}{3}-\frac{1}{6}=\frac{2}{6}-\frac{1}{6}=\frac{1}{6}\).
  2. \(\frac{9}{14}-\frac{2}{7}=\frac{9}{14}-\frac{4}{14}=\frac{5}{14}\).
  3. \(\frac{19}{100}-\frac{1}{10}=\frac{19}{100}-\frac{10}{100}=\frac{9}{100}\).
  4. \(\frac{3}{5}-\frac{11}{25}=\frac{15}{25}-\frac{11}{25}=\frac{4}{25}\).

Ответ: а) \(\frac{1}{6}\); б) \(\frac{5}{14}\); в) \(\frac{9}{100}\); г) \(\frac{4}{25}\).