Ответ:

  1. \(\frac{15}{18}\cdot\frac{9}{15}=\frac{5}{6}\cdot\frac{3}{5}=\frac{1}{2}\).
  2. \(4\cdot\frac{11}{24}=\frac{44}{24}=\frac{11}{6}=1\frac{5}{6}\).
  3. \(\frac{7}{13}\cdot 2\frac{11}{14}=\frac{7}{13}\cdot\frac{39}{14}=\frac{3}{2}=1\frac{1}{2}\).
  4. \(\frac{4}{9}\cdot\frac{3}{25}\cdot\frac{5}{16}=\frac{60}{3600}=\frac{1}{60}\).
  5. \(1\frac{1}{2}\cdot\frac{7}{9}\cdot 2\frac{8}{14}=\frac{3}{2}\cdot\frac{7}{9}\cdot\frac{18}{7}=3\).

Ответ: 1) \(\frac{1}{2}\); 2) \(1\frac{5}{6}\); 3) \(1\frac{1}{2}\); 4) \(\frac{1}{60}\); 5) \(3\).