(6 целых 1/8 -1,75 ): (9-2,2(5 целых 6/11 - 3 целых 5/10 ))*1 целых 2/7

1) 6 1/8 - 1,75 = 5 9/8 - 1 6/8 = 4 3/8

2) 5 6/11 - 3 5/10 = 5 60/110 - 3 55/110 = 2 5/110 = 2 1/22
3) 2,2 • 2 1/22 = 22/10 • 45/22 = 45/10 = 4 1/2
4) 9 - 4 1/2 = 4 1/2

5) 4 3/8 : 4 1/2 = 35/8 : 9/2 = 35/36
6) 35/36 • 1 2/7 = 35/36 • 9/7 = 5/4 = 1 1/4
ответ 1 1/4 ( или 1,25 )