д) \(\frac{2,4 \cdot 12,6 - 3,5}{6,3 \cdot 4,8 - 31,5}\) = \(\frac{30,24 - 3,5}{30,24 - 31,5}\) = \(\frac{26,74}{-1,26}\) = -\(\frac{2674}{126}\) = -\(\frac{1337}{63}\) = -21\(\frac{14}{63}\) = -21\(\frac{2}{9}\)
Ответ: -21\(\frac{2}{9}\)