Ответ:

  1. \(\frac8{25}\cdot\frac5{60}=\frac{40}{1500}=\frac1{37.5}\) — в дробном виде: \(\frac{2}{750}=\frac1{375}\).
  2. \(\frac56\cdot\frac79=\frac{35}{54}\).
  3. \(\frac{37}{68}\cdot\frac{24}{37}=\frac{24}{68}=\frac6{17}\).
  4. \(\frac{27}{50}\cdot\frac{35}{81}=\frac{1}{3}\cdot\frac{35}{50}=\frac7{30}\).