Сторінки 41 - 60 » Стр.51 (8)

12 – 8 = 12 – 2 – 6 = 10 – 6 = 4 43 – 9 = 30 + 13 – 9 = 30 + 4 = 34 53 – 9 – 8 = 40 – 8 + (13 – 9) = 32 + 4 = 36 64 – 8 – 7 = 50 – 8 + (14 – 7) = 42 + 7 = 49