Ответ:
а) \(\frac{2}{3}+\frac{3}{5}=\frac{10+9}{15}=\frac{19}{15}=1\frac{4}{15}\).
б) \(1\frac{1}{6}-\frac{1}{2}=\frac{7}{6}-\frac{3}{6}=\frac{2}{3}\).
в) \(\frac{3}{10}\cdot\frac{5}{9}=\frac{1}{6}\).
г) \(\frac{8}{11}:\frac{2}{5}=\frac{8}{11}\cdot\frac{5}{2}=\frac{20}{11}=1\frac{9}{11}\).
Ответ: а) \(1\frac{4}{15}\); б) \(\frac{2}{3}\); в) \(\frac{1}{6}\); г) \(1\frac{9}{11}\).
