(10 3/4 : 12 : 1 1/5) · 4/9 + 2 1/6 + 3 1/4 : 5 1/5 = 3 целых 155/288
1) 10 3/4 : 12 = 43/4 · 1/12 = 43/48
2) 43/48 : 1 1/5 = 43/48 : 6/5 = 43/48 · 5/6 = 215/288
3) 215/288 · 4/9 = (215·1)/(72·9) = 215/648
4) 3 1/4 : 5 1/5 = 13/4 : 26/5 = 13/4 · 5/26 = (1·5)/(4·2) = 5/8
5) 215/288 + 2 1/6 = 215/288 + 2 48/288 = 2 263/288
6) 2 263/288 + 5/8 = 2 263/288 + 180/288 = 2 443/288 = 3 155/288