Ответ:
- \(\frac{2}{7}+\frac{1}{6}=\frac{12}{42}+\frac{7}{42}=\frac{19}{42}\)
- \(\frac{7}{15}-\frac{1}{15}=\frac{6}{15}=\frac{2}{5}\)
- \(\frac{2}{9}+\frac{7}{18}=\frac{4}{18}+\frac{7}{18}=\frac{11}{18}\)
- \(\frac{14}{21}-\frac{4}{7}=\frac{14}{21}-\frac{12}{21}=\frac{2}{21}\)
- \(\frac{4}{15}+\frac{1}{3}=\frac{4}{15}+\frac{5}{15}=\frac{9}{15}=\frac{3}{5}\)
