(10 3/4 / 12 / 1 1/5) * 4/9 + 2 1/6 + 3 1 / 4 / 5 1/5

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