Ответ:

  1. \(42+24-24=66-24=42\).
  2. \(43+(43-15)=43+28=71\).
  3. \(0\cdot21+20=0+20=20\).
  4. \(40+8\cdot5=40+40=80\).
  5. \(7\cdot9-54=63-54=9\).
  6. \(0\cdot67-0=0-0=0\).
  7. \(64:8-72:9=8-8=0\).
  8. \(35-81:9=35-9=26\).
  9. \(35-35\cdot0=35-0=35\).

Ответ: 42; 71; 20; 80; 9; 0; 0; 26; 35.