8целых 8/9 + 2 целых 11/12 - 3 целых 1/4 ; 10 - (5 целых 7/8 + 3 целых 5/12)

8.8/9+2.11/12-3.1/4=8.32/36+2.33/36-3.9/36=10.65/36-3.9/36=7.56/36=7.14/9=8.5/9
10-(5.7/8+3.5/12)=10-(5.21/24+3.10/24)=10-9.7/24=9.24/24-9.7/24=17/24