5/9 + 1 5/7 · (4 2/3 - 3 5/8) : 1 3/4 = 1 254/441
1) 4 2/3 - 3 5/8 = 4 16/24 - 3 15/24 = 1 1/24
2) 1 5/7 · 1 1/24 = 12/7 · 25/24 = (1·25)/(7·2) = 25/14
3) 25/14 : 1 3/4 = 25/14 : 7/4 = 25/14 · 4/7 = (25·2)/(7·7) = 50/49 = 1 1/49
4) 5/9 + 1 1/49 = 245/441 + 1 9/441 = 1 254/441
ответ: 1 целая 254/441.
