Ответ:

  1. \(\frac{12}{35}\cdot\frac{7}{18}=\frac{2}{15}\).
  2. \(1\frac{7}{33}\cdot1\frac{7}{15}=\frac{40}{33}\cdot\frac{22}{15}=\frac{16}{9}=1\frac{7}{9}\).
  3. \(2\frac{7}{13}\cdot1\frac{11}{15}=\frac{33}{13}\cdot\frac{26}{15}=\frac{22}{5}=4\frac{2}{5}\).
  4. \(4\frac{7}{18}\cdot9=\frac{79}{18}\cdot9=\frac{79}{2}=39\frac{1}{2}\).