4 7/12 - 1 5/12 + 2 11/12 = 4 + 7/12 - 1 - 5/12 + 2 + 11/12= (4 - 1 + 2) + (7/12 - 5/12 + 11/12)= 5 + (7 - 5 + 11)/12= 5 + 13/12= 5 1/12
Ответ: 5 1/12
4 7/12 - 1 5/12 + 2 11/12 = 4 + 7/12 - 1 - 5/12 + 2 + 11/12
= (4 - 1 + 2) + (7/12 - 5/12 + 11/12)
= 5 + (7 - 5 + 11)/12
= 5 + 13/12
= 5 1/12
Ответ: 5 1/12