б) \(\frac{12,75 \cdot \frac{4}{25} \cdot 1,8}{1\frac{1}{2} \cdot 2,04 : 20}\) = \(\frac{12,75 \cdot 0,16 \cdot 1,8}{1,5 \cdot 2,04 : 20}\) = \(\frac{3,672}{3,06 : 20}\) = \(\frac{3,672}{0,153}\) = 24
Ответ: 24