24 + 36 : (2 * 3) = 24 + 36 : 6 = 24 + 6 = 30;
(24 + 36) : 2 * 3 = 60 : 2 * 3 = 30 * 3 = 90;
(24 + 36 : 2) * 3 = (24 + 18) * 3 = 42 * 3 = 126;
(20 * 9 − 6) : 3 = (180 − 6) : 3 = 174 : 3 = 58;
20 * (9 − 6 : 3) = 20 * (9 − 2) = 20 * 7 = 140;
20 * (9 − 6) : 3 = 20 * 3 : 3 = 60 : 3 = 20.