Ответ:

  1. \(91-(4+47)=91-51=40\).
  2. \(24\cdot(11-7)=24\cdot4=96\).
  3. \(18:2+7\cdot3=9+21=30\).
  4. \(21:(24-20)\cdot2=21:4\cdot2=10.5\).
  5. \(21:3-35:5=7-7=0\).
  6. \(30-27+54:6=30-27+9=12\).
  7. \(50-27:3=50-9=41\).
  8. \(8\cdot4-28=32-28=4\).
  9. \(24:(11-7)=24:4=6\).
  10. \(18:2+7\cdot3=9+21=30\).

Ответ: 40; 96; 30; 10.5; 0; 12; 41; 4; 6; 30.