3. Вычислите: 264 - 60 + 1 900 + 99 + 1 700 - 1 - 600 400 - 1 - 300 809 + 80 + 1 390 - 90 - 1

Решение: * 264 - 60 + 1 = 204 + 1 = 205 * 900 + 99 + 1 = 999 + 1 = 1000 * 700 - 1 - 600 = 699 - 600 = 99 * 400 - 1 - 300 = 399 - 300 = 99 * 809 + 80 + 1 = 889 + 1 = 890 * 390 - 90 - 1 = 300 - 1 = 299