4 3/5 - 1 4/5 = (4 + 3/5) - (1 + 4/5)
= 4 + 3/5 - 1 - 4/5
= 4 - 1 + 3/5 - 4/5
= 3 + (-1) + (3-4)/5
= 2 - 1/5

Ответ: 2 - 1/5