1 4/5*x=1 решите пж!!!!

1 целая 4/5 = (1*5+4)/5 = 9/5--------------------------------------------9/5 * х = 1х = 1 : 9/5х = 1 * 5/9х = 5/9Проверка: 9/5 * 5/9 = 45/45 = 1.