Ответ:

  1. \(45+7=52\); \(64+6=70\); \(76-9=67\); \(30-8=22\).
  2. \(70+(15-9)=70+6=76\).
  3. \(15-(14-7)=15-7=8\); \(12-6-4=6-4=2\); \(80-(16-7)=80-9=71\).

Ответ: 52; 70; 67; 22; 76; 8; 2; 71.