Odpowiedź :
(20 + 3) • 5 + 7 - 4 = 23 • 5 + 7 - 4 = 115 + 7 - 4 = 122 - 4 = 118
20 + (3 - 5 + 7) - 4 = 20 + 5 - 4 = 25 - 4 = 21
20 + 3 • (5 + 7) • 4 = 20 + 3 • 12 • 4 = 20 + 36 • 4 = 20 + 144 = 164
(20 + 3) • 5 + 7 - 4 = 23 • 5 + 7 - 4 = 115 + 7 - 4 = 122 - 4 = 118
20 + (3 - 5 + 7) - 4 = 20 + 5 - 4 = 25 - 4 = 21
20 + 3 • (5 + 7) • 4 = 20 + 3 • 12 • 4 = 20 + 36 • 4 = 20 + 144 = 164