Ответ:

  1. \(348+527=875\)
  2. \(1200-478=722\)
  3. \(36\cdot24=864\)
  4. \(936:18=52\)
  5. \(245+378-196=623-196=427\)
  6. \(800-27\cdot8=800-216=584\)
  7. \((145+255):20=400:20=20\)
  8. \(720:(12+6)=720:18=40\)
  9. \(56\cdot7+148=392+148=540\)
  10. \(900-(324+176)=900-500=400\)
  11. \(48\cdot(15-7)=48\cdot8=384\)
  12. \(630:9+47=70+47=117\)

Ответ: 1) 875; 2) 722; 3) 864; 4) 52; 5) 427; 6) 584; 7) 20; 8) 40; 9) 540; 10) 400; 11) 384; 12) 117.