Ответ:
- \(\frac{1}{6}+\frac{7}{10}=\frac{5}{30}+\frac{21}{30}=\frac{26}{30}=\frac{13}{15}\).
- \(\frac{1}{6}-\frac{1}{12}=\frac{2}{12}-\frac{1}{12}=\frac{1}{12}\).
- \(\frac{2}{25}+\frac{1}{9}=\frac{18}{225}+\frac{25}{225}=\frac{43}{225}\).
- \(\frac{3}{4}-\frac{31}{42}=\frac{63}{84}-\frac{62}{84}=\frac{1}{84}\).
- \(\frac{7}{12}+\frac{3}{20}=\frac{35}{60}+\frac{9}{60}=\frac{44}{60}=\frac{11}{15}\).
