Ответ:

  1. \((13 - 9.5 : 3.8) \cdot 0.3 = (13 - 2.5) \cdot 0.3 = 10.5 \cdot 0.3 = 3.15\).

  2. \((16.1 : 4.6 - 3.07) \cdot 0.2 = (3.5 - 3.07) \cdot 0.2 = 0.43 \cdot 0.2 = 0.086\).

  3. \((1.3 \cdot 2.8 + 1) : 0.8 = (3.64 + 1) : 0.8 = 4.64 : 0.8 = 5.8\).

  4. \((3.7 \cdot 2.3 - 5) : 0.3 = (8.51 - 5) : 0.3 = 3.51 : 0.3 = 11.7\).

Ответ: 1) 3,15; 2) 0,086; 3) 5,8; 4) 11,7.