Задача Задача №3371299
А
А
3+9
12
If you want a quick method: 3 + 9 = (3 + 10) - 1 = 12. Want a few practice problems?
Мобильные приложения
12
If you want a quick method: 3 + 9 = (3 + 10) - 1 = 12. Want a few practice problems?
Мобильные приложения