Ответ:

  1. \(75:(18-6:2)+3\cdot(15-9)=75:(18-3)+3\cdot6=75:15+18=23\).
  2. \((45-15:3):5+2\cdot(8-3)=(45-5):5+10=40:5+10=18\).
  3. \(63:(21-14)\cdot3-(18:6+5)=63:7\cdot3-(3+5)=27-8=19\).
  4. \((32:8+7):2-16:(4+4)=(4+7):2-16:8=11:2-2=3.5\).
  5. \(90:(12-6:3)+4\cdot(10-7)=90:(12-2)+4\cdot3=90:10+12=21\).
  6. \(56:8+(12-4):3-15:5=7+8:3-3=4+8:3=\frac{26}{3}=8\frac{2}{3}\).
  7. \((36:6-8)\cdot2-18:3+5=(6-8)\cdot2-6+5=-4-1=-5\).
  8. \(90-(27:3+11):5\cdot4=90-(9+11):5\cdot4=90-20:5\cdot4=90-16=74\).
  9. \(48:(16-8)+3\cdot(7-4)=48:8+3\cdot3=6+9=15\).
  10. \((54:9+6)\cdot3-21:7=(6+6)\cdot3-3=36-3=33\).

Ответ: 23; 18; 19; 3,5; 21; \(8\frac{2}{3}\); −5; 74; 15; 33.