Question

39×（56分之31＋22分之7）＋17×（56分之31减去22分之7）

Answer 1

39 × (31/56 + 7/22) + 17 × (31/56 - 7/22) = 39 × 31/56 + 39 × 7/22 + 17 × 31/56 - 17 × 7/22 = (39 + 17) × 31/56 + (39 - 17) × 7/22 = 56 × 31/56 + 22 × 7/22 = 31 + 7 = 38