Вправи 301 - 401 » 360

80 – 40 : 8 = 80 – 5 = 75 (80 – 40) : 8 = 40 : 8 = 5 30 : 5 : 2 = 6 : 2 = 3 30 : 5 : 3 = 6 : 3 = 2 67 – 35 – 17 = 67 – 17 – 35 = 50 – 35 = 15 67 – (35 – 17) = 67 – 18 = 67 – 18 = 67 – 17 – 1 = 49