285 - 213 = 72
72 : 9 = 8
8 + 37 = 45
45 : 15 = 3
800 : 16 = 50
50 * 7 = 350
350 - 206 = 144
144 : 12 = 12
56 : 7 = 8
8 * 3 = 24
24 + 33 = 57
57 : 19 = 3
100 - 55 = 45 45 : 9 = 5 5 + 27 = 32 32 : 16 = 2
Ответ: а) 3, б) 12, в) 3, г) 2