Ответ:

  1. \(1-\frac{8}{19}=\frac{19}{19}-\frac{8}{19}=\frac{11}{19}\).

  2. \(6-\frac{9}{14}=5+\frac{14}{14}-\frac{9}{14}=5\frac{5}{14}\).

  3. \(7-1\frac{8}{9}=6-\frac{8}{9}=5+\frac{1}{9}=5\frac{1}{9}\).

  4. \(11-4\frac{3}{16}=7-\frac{3}{16}=6+\frac{13}{16}=6\frac{13}{16}\).

Ответ: 1) 11/19; 2) 5 5/14; 3) 5 1/9; 4) 6 13/16.