В) 12(4,8p-4-4,5(4/5p-0,4k).

Упрощаем выражение: \[\frac{5}{12} \cdot \left( 4.8p - 4 - 4.5 \cdot \left( \frac{4}{5}p - 0.4k \right) \right) = \frac{5}{12} \cdot \left( 4.8p - 4 - \frac{9}{2} \cdot \left( \frac{4}{5}p - \frac{2}{5}k \right) \right) = \frac{5}{12} \cdot \left( 4.8p - 4 - \frac{18}{5}p + \frac{9}{5}k \right) = \frac{5}{12} \cdot \left( \frac{24}{5}p - 4 - \frac{18}{5}p + \frac{9}{5}k \right) = \frac{5}{12} \cdot \left( \frac{6}{5}p - 4 + \frac{9}{5}k \right) = \frac{1}{2}p - \frac{5}{3} + \frac{3}{4}k\]

Далее, умножаем на 12: \[12 \cdot \left( \frac{1}{2}p - \frac{5}{3} + \frac{3}{4}k \right) = 6p - 20 + 9k\]