600 : 20 × 5 : 2 = 30 × 5 : 2 = 150 : 2 = 75
600 : (20 × 5) : 2 = 600 : 100 : 2 = 6 : 2 = 3
75 > 3
128 : 4 × 3 + 5 × 3 = 32 × 3 + 5 × 3 = 96 + 15 = 111
128 : 4 × (3 + 5) × 3 = 128 : 4 × 8 × 3 = 32 × 8 × 3 = 256 × 3 = 768
111 < 768
54 : (9 - 3) × (72 : 36) = 54 : 6 × 2 = 9 × 2 = 18
54 : 9 - 3 × (72 : 36) = 54 : 9 - 3 × 2 = 6 - 3 × 2 = 6 - 6 = 0
18 > 0