Ответ:

  1. \(0.97-0.43=0.54\); \(0.54+0.16=0.7\); \(0.7\cdot0.5=0.35\).
  2. \(3.4-1.4=2\); \(2\cdot0.3=0.6\); \(0.6+0.04=0.64\).
  3. \(5\cdot0.7=3.5\); \(3.5+2.7=6.2\); \(6.2-4.9=1.3\).
  4. \(0.68-0.39=0.29\); \(0.29+0.21=0.5\); \(0.5\cdot0.3=0.15\).

Ответ: 1) 0,35; 2) 0,64; 3) 1,3; 4) 0,15.