а) \( 0.3 \cdot (13 - 11.5 : 4.6) = 0.3 \cdot (13 - 2.5) = 0.3 \cdot 10.5 = 3.15 \)
б) \( (13.3 : 3.8 - 3.05) \cdot 0.4 = (3.5 - 3.05) \cdot 0.4 = 0.45 \cdot 0.4 = 0.18 \)
в) \( (2.4 \cdot 1.3 + 3) : 0.6 = (3.12 + 3) : 0.6 = 6.12 : 0.6 = 10.2 \)
г) \( (2.8 \cdot 3.1 - 4) : 0.4 = (8.68 - 4) : 0.4 = 4.68 : 0.4 = 11.7 \)