91/4*8 -1 2/3*5 1/2 - 4/5 * 2 11/12 =

1) 9 1/4 * 8 = 37/4 * 8 = 37 * 2 = 74 
2) 1 2/3 * 5 1/2 = 5/3 * 11/2 = 55/6 = 9 1/6 
3) 4/5 * 2 11/12 = 4/5 * 35/12 = 7/3 = 2 1/3 
4) 74 - 9 1/6 - 2 1/3 = 74 - 8 7/6 - 2 2/6 = 74 - 10 9/6 = 73 2/2 - 11 1/2 = 62 1/2 
ответ 62 1/2 

9 1/4*8 -1 2/3*5 1/2 - 4/5 * 2 11/12 = 62 1/2 или 62,5
1) 9 1/4*8 = 37/4*8 = 74
2) 1 2/3*5 1/2 = 5/3*11/2 = 55/6 = 9 1/6
3) 4/5*2 11/12 = 4/5*35/12 = 7/3 = 2 1/3
4) 74-9 1/6 = 74-55/6 = 444/6-55/6 = 389/6 = 64 5/6
5) 64 5/6-2 1/3 = 389/6-7/3 = 389/6-14/6 = 375/6 = 125/2 = 62 1/2 или 62,5