Вариант 4: 1) \(\frac{3}{7}+\frac{2}{4}\); 2) \(\frac{6}{7}+\frac{3}{14}\); 3) \(\frac{2}{3}+\frac{7}{22}\); 4) \(\frac{4}{5}+\frac{3}{20}\); 5) \(\frac{4}{9}+\frac{7}{18}\); 6) \(\frac{9}{10}+\frac{4}{15}\); 7) \(\frac{5}{6}+\frac{3}{14}\); 8) \(\frac{5}{12}+\frac{1}{18}\); 9) \(\frac{1}{8}+\frac{3}{12}\); 10) \(\frac{3}{4}+\frac{1}{6}\).

Чтобы сложить дроби, приводим их к общему знаменателю, складываем числители и сокращаем результат.

1. \(\frac{3}{7}+\frac{2}{4}=\frac{6}{14}+\frac{7}{14}=\frac{13}{14}\).
2. \(\frac{6}{7}+\frac{3}{14}=\frac{12}{14}+\frac{3}{14}=\frac{15}{14}=1\frac{1}{14}\).
3. \(\frac{2}{3}+\frac{7}{22}=\frac{44}{66}+\frac{21}{66}=\frac{65}{66}\).
4. \(\frac{4}{5}+\frac{3}{20}=\frac{16}{20}+\frac{3}{20}=\frac{19}{20}\).
5. \(\frac{4}{9}+\frac{7}{18}=\frac{8}{18}+\frac{7}{18}=\frac{15}{18}=\frac{5}{6}\).
6. \(\frac{9}{10}+\frac{4}{15}=\frac{27}{30}+\frac{8}{30}=\frac{35}{30}=\frac{7}{6}=1\frac{1}{6}\).
7. \(\frac{5}{6}+\frac{3}{14}=\frac{35}{42}+\frac{9}{42}=\frac{44}{42}=\frac{22}{21}=1\frac{1}{21}\).
8. \(\frac{5}{12}+\frac{1}{18}=\frac{15}{36}+\frac{2}{36}=\frac{17}{36}\).
9. \(\frac{1}{8}+\frac{3}{12}=\frac{1}{8}+\frac{1}{4}=\frac{3}{8}\).
10. \(\frac{3}{4}+\frac{1}{6}=\frac{9}{12}+\frac{2}{12}=\frac{11}{12}\).