a) \( \frac{3,9-7,3}{0,2} = \frac{-3,4}{0,2} = -17 \)
б) \( \frac{5,6+9,7}{0,02} = \frac{15,3}{0,02} = 765 \)
в) \( \frac{18}{4,5 \cdot 2,5} = \frac{18}{11,25} = 1,6 \)
г) \( \frac{3,9 \cdot 4,8}{14,4} = \frac{18,72}{14,4} = 1,3 \)