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

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

1 ) 9 1/4 • 8 = 37/4 • 8/1 = 74

2) 1 2/3 • 5 1/2 = 5/3 • 11/2 = 55/6 = 9 1/6

3) 74 - 9 1/6 = 65 - 1/6 = 64 5/6

4) 4/5 • 2 11/12 = 4/5 • 35/12 = 7/3 = 2 1/3

5) 64 5/6 - 2 1/3 = 62 (5/6 - 2/6) = 62 3/6 = 62,5

ответ: 62,5