Ответ:
- \(\frac{3}{7}+\frac{2}{9}=\frac{27}{63}+\frac{14}{63}=\frac{41}{63}\).
- \(\frac{2}{3}-\frac{1}{6}=\frac{4}{6}-\frac{1}{6}=\frac{1}{2}\).
- \(\frac{13}{20}-\frac{7}{15}=\frac{39}{60}-\frac{28}{60}=\frac{11}{60}\).
- \(\frac{11}{16}+\frac{5}{12}=\frac{33}{48}+\frac{20}{48}=\frac{53}{48}=1\frac{5}{48}\).
- \(\frac{9}{14}-\frac{8}{21}=\frac{27}{42}-\frac{16}{42}=\frac{11}{42}\).
- \(\frac{19}{30}-\frac{2}{5}+\frac{1}{3}=\frac{19}{30}-\frac{12}{30}+\frac{10}{30}=\frac{17}{30}\).
