Ответ:

  1. \(603\cdot84+2536=50652+2536=53188\);
  2. \(318\cdot56-5967=17808-5967=11841\);
  3. \(64\cdot96-77=6144-77=6067\);
  4. \(64\cdot(96-77)=64\cdot19=1216\).