Однацелая кароче я незнаю
39 = (30 + 9) : 3 = 10 + 3 = 13 13 * 3 = 39
52 = (40 + 12) : 4 = 10 + 3 = 13 13 * 4 = 52
84 = (42 + 42) : 2 = 21 + 21 = 42 42 * 2 = 84
75 = (50 + 25) : 5 = 10 + 5 = 15 15 * 5 = 75
91 = (70 + 21) : 7 = 10 + 3 = 13 13 * 7 = 91
1) ( 120 + 36) : 12 = 120 : 12 + 36 : 12 = 10 + 3 = 13
2) (230 + 23) : 23 = 230 : 23 + 23 : 23 = 10 + 1 = 11
3) (90 + 36) : 9 = 90 : 9 + 36 : 9 = 10 + 4 = 14
4) 189 - 21 = 168
(168 + 21) : 21 = 168 : 21 + 21 : 21 = 8 + 1 = 9
Окей
Промежуток в виде неравенства: