Ответ:

а) \(\frac{1}{4}-\frac{1}{6}=\frac{3}{12}-\frac{2}{12}=\frac{1}{12}\).

б) \(\frac{3}{5}+\frac{1}{3}=\frac{9}{15}+\frac{5}{15}=\frac{14}{15}\).

в) \(\frac{4}{5}+\frac{3}{4}=\frac{16}{20}+\frac{15}{20}=\frac{31}{20}=1\frac{11}{20}\).

г) \(\frac{7}{10}-\frac{1}{4}=\frac{14}{20}-\frac{5}{20}=\frac{9}{20}\).

Ответ: а) \(\frac{1}{12}\); б) \(\frac{14}{15}\); в) \(1\frac{11}{20}\); г) \(\frac{9}{20}\).