6целых 5\6-2,875+2 целых 11\12-7 целых 3\8 3 целых 9\16- 5,25-4 целых 1\8+4,8125

6*5/6 - 2,875 + 2*11/12 - 7*3/8 = 41/6 - 2875/1000 + 35/12 - 59/8 = -0,5
1) 41/6 - 2875/1000 = 20500-8625/3000=11875/3000=95/24
2) 95/24 + 35/12 = 95+70/24 = 165/24 = 55/8
3) 55/8 - 59/8 = -4/8 = -1/2 = -0,5

3*9/16 - 5,25 - 4*1/8 + 4,8125 = 57/16 - 525/100 - 33/8 + 48125/10000 = -1
1) 57/16 - 525/100 = 57/16 - 21/4 = 57-84/16 = -27/16
2) -27/16 - 33/8 = -93/16 = -5,8125
3) -5,8125 + 4,8125 = -1