Ответ:

  1. \(x+3.72=8\); \(x=8-3.72=4.28\).
  2. \(14.6-x=5.293\); \(x=14.6-5.293=9.307\).
  3. \(x-12.956=11.034\); \(x=11.034+12.956=23.99\).
  4. \((28-x)+35.6=43.214\); \(63.6-x=43.214\); \(x=63.6-43.214=20.386\).

Ответ: 1) 4,28; 2) 9,307; 3) 23,99; 4) 20,386.