7 5/12 - 5 3/4 = (это смешанные дроби)
7 5/12 - 5 3/4 = 89/12 - 23/4 =(89 × 1 - 23 × 3)/12 = 89/12 - 69/12 = 20/12 = 5/3 = 1 2/3
7 5/12 - 5 3/4 =7 5/12 - 5 9/12 = 6 17/12 - 5 9/12 =1 8/12 = 1 2/3