9 1/4 × 8 - 3 2/3 × 5 1/2 - 12 2/5 × 4 7/12 = - 3.
1) 9 1/4 · 8 = 9 · 8 + 1/4 · 8 = 72 + 8/4 = 72 + 2 = 74
2) 3 2/3 · 5 1/2 = 11/3 · 11/2 = 121/6 = 20 целых 1/6
3) 12 2/5 · 4 7/12 = 62/5 · 55/12 = (31·11)/(1·6) = 341/6 = 56 целых 5/6
4) 74 - 20 1/6 = 73 6/6 - 20 1/6 = 53 целых 5/6
5) 53 5/6 - 56 5/6 = - 3
