Сторінки 41 - 60 » Стр.48 (7)

(56 + 38) – 18 = 56 + (38 – 18) = 56 + 20 = 76 (46 + 54) – 30 = (40 + 50 + 6 + 4) – 30 = (90 + 10) – 30 = 100 – 30 = 70 (28 + 46) – 16 = 28 + (46 – 16) = 28 + 30 = 58