3. Вычислите: а) \(\frac{2}{18}+\frac{5}{18}\); б) \(\frac{4}{5}-\frac{3}{4}\); в) \(\frac{2}{15}+\frac{1}{3}\); г) \(\frac{5}{16}-\frac{1}{24}\).

1. а) \(\frac{2}{18}+\frac{5}{18}=\frac{7}{18}\).
2. б) \(\frac{4}{5}-\frac{3}{4}=\frac{16}{20}-\frac{15}{20}=\frac{1}{20}\).
3. в) \(\frac{2}{15}+\frac{1}{3}=\frac{2}{15}+\frac{5}{15}=\frac{7}{15}\).
4. г) \(\frac{5}{16}-\frac{1}{24}=\frac{15}{48}-\frac{2}{48}=\frac{13}{48}\).

Ответ: а) \(\frac{7}{18}\); б) \(\frac{1}{20}\); в) \(\frac{7}{15}\); г) \(\frac{13}{48}\).