Ответ:

  1. А) \(\frac{4}{8}+\frac{5}{9}=\frac{1}{2}+\frac{5}{9}=\frac{9}{18}+\frac{10}{18}=\frac{19}{18}=1\frac{1}{18}\).
  2. Б) \(\frac{4}{7}-\frac{5}{9}=\frac{36}{63}-\frac{35}{63}=\frac{1}{63}\).
  3. В) \(\frac{19}{20}-\frac{3}{4}=\frac{19}{20}-\frac{15}{20}=\frac{4}{20}=\frac{1}{5}\).
  4. Г) \(4\frac{1}{6}+1\frac{5}{12}=4\frac{2}{12}+1\frac{5}{12}=5\frac{7}{12}\).

Ответ: А) \(1\frac{1}{18}\); Б) \(\frac{1}{63}\); В) \(\frac{1}{5}\); Г) \(5\frac{7}{12}\).