Вправи 1 - 100 » 62

560 – 3 • 10 = 560 – 30 = 500 + (60 – 30) = 500 + 30 = 530 560 + 3 • 10 = 560 + 30 = 500 + (60 + 30) = 500 + 90 = 590 120 – 80 : 8 = 120 – 10 = 120 – 10 = 110 (120 – 80) : 8 = (120 – 20 – 60) : 8 = (100 – 60) : 8 = 40 : 8 = 5 670 – 540 – 50 = (600 – 500) + (70 – 40) – 50 = 100 + 30 – 50 = 100 – 50 + 30 = 50 + 30 = 80 60 + 70 + 320 = 6 д. + 7 д. + 32 д. = 13 д. + 32 д. = (10 д. + 30 д.) + (3 д. + 2 д.) = 40 д. + 5 д. = 45 д. = 450