Ответ:

  1. \(14.38-7.581+6.003-2.8503=6.799+6.003-2.8503=12.802-2.8503=9.9517\)

  2. \((16.4-9.806+3.047)-(16.7-9.431-0.89)\)

    \(=(9.641)-(6.379)=3.262\)

  3. \(828.4-(256.3+16.031-28.49)=828.4-243.841=584.559\)

Ответ: 1) \(9.9517\); 2) \(3.262\); 3) \(584.559\).