Ответ:

  1. \(4.98+52.462=57.442\).
  2. \(36.45-6.714=29.736\).
  3. \(38-4.952=33.048\).
  4. \(34.7-(6.76+0.987)=34.7-7.747=26.953\).

Ответ: 1) 57,442; 2) 29,736; 3) 33,048; 4) 26,953.