Вычислите выражения в столбце Б.

Приводим дроби к общему знаменателю, затем выполняем действие с числителями.

1. \(\frac{1}{3}-\frac{1}{6}=\frac{2}{6}-\frac{1}{6}=\frac{1}{6}\)
2. \(\frac{3}{20}+\frac{3}{4}=\frac{3}{20}+\frac{15}{20}=\frac{9}{10}\)
3. \(\frac{7}{9}-\frac{2}{3}=\frac{7}{9}-\frac{6}{9}=\frac{1}{9}\)
4. \(\frac{1}{4}+\frac{1}{5}=\frac{5}{20}+\frac{4}{20}=\frac{9}{20}\)
5. \(\frac{2}{5}+\frac{4}{15}=\frac{6}{15}+\frac{4}{15}=\frac{2}{3}\)
6. \(\frac{1}{3}+\frac{1}{4}=\frac{4}{12}+\frac{3}{12}=\frac{7}{12}\)
7. \(\frac{2}{3}-\frac{2}{5}=\frac{10}{15}-\frac{6}{15}=\frac{4}{15}\)
8. \(\frac{1}{5}-\frac{1}{6}=\frac{6}{30}-\frac{5}{30}=\frac{1}{30}\)
9. \(\frac{1}{2}+\frac{1}{4}=\frac{2}{4}+\frac{1}{4}=\frac{3}{4}\)
10. \(\frac{7}{6}-1=\frac{7}{6}-\frac{6}{6}=\frac{1}{6}\)
11. \(\frac{1}{2}+\frac{2}{7}=\frac{7}{14}+\frac{4}{14}=\frac{11}{14}\)
12. \(\frac{1}{2}-\frac{1}{3}=\frac{3}{6}-\frac{2}{6}=\frac{1}{6}\)
13. \(\frac{3}{4}+\frac{1}{8}=\frac{6}{8}+\frac{1}{8}=\frac{7}{8}\)
14. \(\frac{5}{6}-\frac{7}{12}=\frac{10}{12}-\frac{7}{12}=\frac{1}{4}\)
15. \(\frac{2}{5}+\frac{3}{10}=\frac{4}{10}+\frac{3}{10}=\frac{7}{10}\)