Ответ:

  1. \(197\cdot5=985\).
  2. \(307\cdot3-704:8=921-88=833\).
  3. \(684:9+(506-102\cdot3)=76+(506-306)=76+200=276\).
  4. \(216\cdot4=864\).
  5. \(65\cdot8-535:5=520-107=413\).
  6. \(736:4+(607-428:4)=184+(607-107)=184+500=684\).