2. (47.09 + 16.51) : 0.12 = 63.6 : 0.12 = 530
3.
P 28.8 : 4.5 = 6.4
P 6.4 = 640,0
F 28.8 + 4.5 = 33.3
F 28.8 - 4.5 = 24. 3