Ответ:

  1. \(35:x-1.2=3.8\); \(35:x=5\); \(x=7\).
  2. \(2.8+x+3.7=12.5\); \(x+6.5=12.5\); \(x=6\).
  3. \(y:2+3.7=7.7\); \(y:2=4\); \(y=8\).
  4. \(5.6-x+3.8=4.4\); \(9.4-x=4.4\); \(x=5\).
  5. \(12:m-0.2=3.8\); \(12:m=4\); \(m=3\).
  6. \(x-5.4+2.3=5.2\); \(x-3.1=5.2\); \(x=8.3\).

Ответ: 1) \(x=7\); 2) \(x=6\); 3) \(y=8\); 4) \(x=5\); 5) \(m=3\); 6) \(x=8.3\).