Вычислите: 1) 2/5 + 1/10; 2) 5/6 + 2/3; 3) 3/4 + 7/12; 4) 2/15 + 4/5; 5) 5/7 + 3/14; 6) 3/11 + 6/55; 7) 1/6 + 1/9; 8) 1/10 + 1/15; 9) 2/8 + 1/12; 10) 1/9 + 1/2.

1. \(\frac{2}{5}+\frac{1}{10}=\frac{4}{10}+\frac{1}{10}=\frac{5}{10}=\frac{1}{2}\).
2. \(\frac{5}{6}+\frac{2}{3}=\frac{5}{6}+\frac{4}{6}=\frac{9}{6}=\frac{3}{2}\).
3. \(\frac{3}{4}+\frac{7}{12}=\frac{9}{12}+\frac{7}{12}=\frac{16}{12}=\frac{4}{3}\).
4. \(\frac{2}{15}+\frac{4}{5}=\frac{2}{15}+\frac{12}{15}=\frac{14}{15}\).
5. \(\frac{5}{7}+\frac{3}{14}=\frac{10}{14}+\frac{3}{14}=\frac{13}{14}\).
6. \(\frac{3}{11}+\frac{6}{55}=\frac{15}{55}+\frac{6}{55}=\frac{21}{55}\).
7. \(\frac{1}{6}+\frac{1}{9}=\frac{3}{18}+\frac{2}{18}=\frac{5}{18}\).
8. \(\frac{1}{10}+\frac{1}{15}=\frac{3}{30}+\frac{2}{30}=\frac{1}{6}\).
9. \(\frac{2}{8}+\frac{1}{12}=\frac{1}{4}+\frac{1}{12}=\frac{3}{12}+\frac{1}{12}=\frac{1}{3}\).
10. \(\frac{1}{9}+\frac{1}{2}=\frac{2}{18}+\frac{9}{18}=\frac{11}{18}\).

Ответ: 1) \(\frac{1}{2}\); 2) \(\frac{3}{2}\); 3) \(\frac{4}{3}\); 4) \(\frac{14}{15}\); 5) \(\frac{13}{14}\); 6) \(\frac{21}{55}\); 7) \(\frac{5}{18}\); 8) \(\frac{1}{6}\); 9) \(\frac{1}{3}\); 10) \(\frac{11}{18}\).