69 - 54 : 3 + 6 = 63
69 - (54 : 3) + 6 = 69 - 18 + 6 = 51 + 6 = 57 ≠ 63
69 - 54 : (3 + 6) = 69 - 54 : 9 = 69 - 6 = 63
69 - 54 : 3 + 6 = 11
(69 - 54) : 3 + 6 = 15 : 3 + 6 = 5 + 6 = 11
69 - 54 : 3 + 6 = 57
69 - (54 : 3) + 6 = 69 - 18 + 6 = 51 + 6 = 57
69 - 54 : 3 + 6 = 45
(69 - 54) : 3 + 6 = 15 : 3 + 6 = 5 + 6 = 11 ≠ 45
(69 - 54) : (3 + 6) = 15 : 9 = 1 (ост. 6) ≠ 45
69 - (54 : 3 + 6) = 69 - (18 + 6) = 69 - 24 = 45