17/9-1/9=16/9
1/4×16/9=4/9
2/3+4/9=6/9+4/9=10/9
4 2/3 + 1/4 · (1 7/9 - 1/9) = 5 1/12
1) 1 7/9 - 1/9 = 1 6/9 = 1 2/3 = 5/3
2) 1/4 · 5/3 = 5/12
3) 4 2/3 + 5/12 = 4 8/12 + 5/12 = 4 13/12 = 5 1/12
ответ: 5 целых 1/12.
