(2 5/6 + 2 2/9) : 3 1/4 - 2/7 : 9/7 = 1 1/9
1) 2 5/6 + 2 2/9 = 2 15/18 + 2 4/18 = 4 19/18 = 5 1/18;
2) 5 1/18 : 3 1/4 = 91/18 : 13/4 = 91/18 · 4/13 = (7·2)/(9·1) = 14/9 = 1 5/9;
3) 2/7 : 9/7 = 2/7 · 7/9 = 2/9;
4) 1 5/9 - 4/9 = 1 1/9.
ответ: 1 целая 1/9.
(2 5/6 + 2 2/9) : 3 1/4 - 2/7 : 9/7 = 1 1/9
1) 2 5/6 + 2 2/9 = 2 15/18 + 2 4/18 = 4 19/18 = 5 1/18;
2) 5 1/18 : 3 1/4 = 91/18 : 13/4 = 91/18 · 4/13 = (7·2)/(9·1) = 14/9 = 1 5/9;
3) 2/7 : 9/7 = 2/7 · 7/9 = 2/9;
4) 1 5/9 - 4/9 = 1 1/9.
ответ: 1 целая 1/9.