Ответ:

  1. \(\frac2{15}\cdot3=\frac6{15}=\frac25\).
  2. \(\frac4{11}\cdot3=\frac{12}{11}=1\frac1{11}\).
  3. \(\frac89\cdot2=\frac{16}{9}=1\frac79\).
  4. \(\frac4{49}\cdot7=\frac{28}{49}=\frac47\).
  5. \(7\cdot\frac3{40}=\frac{21}{40}\).
  6. \(6\cdot\frac{15}{18}=\frac{90}{18}=5\).
  7. \(\frac7{12}\cdot24=7\cdot2=14\).
  8. \(45\cdot\frac8{15}=3\cdot8=24\).