1)9 1/4 × 8 = 37/4 × 8/1 =296/4= 74
2)1 2/3 × 5 1/2 = 5/3 × 11/2 = 55/6 = 9 1/6
3)4 2/5 × 4 7/12 = 22/5 × 55/12 =1210/60 = 121/6 = 20 1/6
4)74 - 9 1/6 = 74/1 - 55/6 =(74 × 6 - 55 × 1)/6 = 444/6 - 55/6 = 389/6 = 64 5/6
5)64 5/6 - 20 1/6 = 389/6 - 121/6 = 268/6 = 134/3 = 44 2/3
ответ :44 2/3