4целые2/5: (1целая1/2-2/5)+(3/4+5/6): 4целые3/4

4 2/5 : (1 1/2 - 2/5) + (3/4 + 5/6) : 4 3/4 = 4 1/3
1) 1 1/2 - 2/5 = 1 5/10 - 4/10 = 1 1/10
2) 3/4 + 5/6 = 9/12 + 10/12 = 19/12 = 1 7/12
3) 4 2/5 : 1 1/10 = 22/5 : 11/10 = 22/5 * 10/11 = 2 * 2 = 4
4) 1 7/12 : 4 3/4 = 19/12 : 19/4 = 19/12 * 4/19 = 4/12 = 1/3
5) 4 + 1/3 = 4 1/3