Вправи 401 - 500 » 431

510 – 230 = 510 – 210 – 20 = 300 – 20 = 280 650 – 360 = 650 – 350 – 10 = 300 – 10 = 290 420 – 240 = 420 – 220 – 20 = 200 – 20 = 180 930 – 670 = 930 – 630 – 40 = 300 – 40 = 260