Ответ:

  1. \(742+2658=3400\).
  2. \(5472-458=5014\).
  3. \(362\cdot26=362\cdot20+362\cdot6=7240+2172=9412\).
  4. \(102\cdot39=102\cdot40-102=4080-102=3978\).
  5. \(1680:48=35\).
  6. \(8712:33=264\).

Ответ: 3400; 5014; 9412; 3978; 35; 264.