Сторінки 41 - 60 » Стр.46-(3)

43 + 37 – 60 = (40 + 30) + (3 + 7) – 60 = 70 + 10 – 60 = 80 – 60 = 20 54 – 26 + 42 = 40 – 20 + 14 – 6 + 42 = 20 + 8 + 42 = 20 + 50 = 70 24 + 48 + 18 = (20 + 40) + (4 + 8) + 18 = 60 + 12 + 18 = 60 + 10 + 10 + 2 + 8 = 60 + 20 + 10 = 90