M -2/5 = 1/3 пжжжжжжжжжжжжжжжжжжжжжжжжжжж
M - 2/5 = 1/3. M = 1/3 + 2/5. M = 5/15 + 6/15. M = 11/15. проверка: 11/15 - 2/5 = 1/3, 11/15 - 6/15 = 1/3, 5/15 = 1/3, 1/3 = 1/3
М=1/3+2/5; М=6/15+5/15; М=11/15