Сложение дробей 1/15+2/45+7/15
1/15 + 2/45 + 7/15 = 8/15 + 2/45 = 24/45 + 2/45 = 26/45
1/15 + 2/45 + 7/15 = (1/15 + 7/15) + 2/45 = 8/15 + 2/45 = 24/45 + 2/45 = 26/45
спасибо