Ответ:

  1. \(\frac{3}{7}+\frac{4}{5}=\frac{15}{35}+\frac{28}{35}=\frac{43}{35}=1\frac{8}{35}\).
  2. \(\frac{11}{13}+\frac{5}{7}=\frac{77}{91}+\frac{65}{91}=\frac{142}{91}=1\frac{51}{91}\).
  3. \(\frac{14}{19}+\frac{3}{5}=\frac{70}{95}+\frac{57}{95}=\frac{127}{95}=1\frac{32}{95}\).
  4. \(\frac{44}{32}+\frac{15}{25}=\frac{11}{8}+\frac{3}{5}=\frac{55}{40}+\frac{24}{40}=\frac{79}{40}=1\frac{39}{40}\).

Ответ: \(1\frac{8}{35};\ 1\frac{51}{91};\ 1\frac{32}{95};\ 1\frac{39}{40}\).