3 1/3+1 3/9×3-4 5/4 = 10/3+ 12/9 × 3 - 21/4 = 10/3+ 12/9 × 3 - 21/4 = 10/3+ 12/3 - 21/4 = 22/3 - 21/4 = 88/12 - 63/12 = 25/12 = 2 1/12