решите уравнение:3/5а+2/3а=3 целых 4/5

3/5а + 2/3а = 3 целых 4/59/15а + 10/15а = 19/519/15а = 19/5а = 19/5 : 19/15 = 19/5 * 15/19 = 15/5а = 3Общий знаменатель 1515 : 5 = 3 - доп.множ. к 3/5 = (3*3)/(5*3) = 9/1515 : 3 = 5 - доп.множ. к 2/3 = (2*5)/(3*5) = 10/153 целых 4/5 = (3*5+4)/5 = 19/5