Ответ:

  1. \(3.5\cdot19=66.5\);
  2. \(7.4\cdot0.8=5.92\);
  3. \(0.6\cdot6.37=3.822\);
  4. \(8.36\cdot4.2=35.112\);
  5. \(0.8\cdot1.25=1\);
  6. \(6.25\cdot0.64=4\);
  7. \(0.3\cdot0.3=0.09\);
  8. \(1.4\cdot0.04=0.056\).

Ответ: 66,5; 5,92; 3,822; 35,112; 1; 4; 0,09; 0,056.