Odpowiedź :
20 + (3 × 5) + 7 × 4 = 20 + 15 + 28 = 35 + 28 = 63
(20 + 3) × 5 + 7 × 4 = 23 × 5 + 28 = 115 + 28 = 143
20 + 3 × (5 + 7) × 4 = 20 + 3 × 12 × 4 = 20 + 36 × 4 = 20 + 144 = 164
20 + (3 × 5) + 7 × 4 = 20 + 15 + 28 = 35 + 28 = 63
(20 + 3) × 5 + 7 × 4 = 23 × 5 + 28 = 115 + 28 = 143
20 + 3 × (5 + 7) × 4 = 20 + 3 × 12 × 4 = 20 + 36 × 4 = 20 + 144 = 164