Ответ:

  1. \(4,63+3,54=8,17\).
  2. \(8,051+1,940=9,991\).
  3. \(7,29-0,28=7,01\).
  4. \(13,406-5,214=8,192\).

Ответ: 8,17; 9,991; 7,01; 8,192.