№1. Выполните сложение: 1/6 + 1/9; 5/12 + 1/15; 3/8 + 5/16; 1/4 + 2/3.

1. \(\frac{1}{6}+\frac{1}{9}=\frac{3}{18}+\frac{2}{18}=\frac{5}{18}\).
2. \(\frac{5}{12}+\frac{1}{15}=\frac{25}{60}+\frac{4}{60}=\frac{29}{60}\).
3. \(\frac{3}{8}+\frac{5}{16}=\frac{6}{16}+\frac{5}{16}=\frac{11}{16}\).
4. \(\frac{1}{4}+\frac{2}{3}=\frac{3}{12}+\frac{8}{12}=\frac{11}{12}\).

Ответ: \(\frac{5}{18};\ \frac{29}{60};\ \frac{11}{16};\ \frac{11}{12}\).