(3/4+5/6): (1 1/2-3/5)×1 8/19-(1 -7/8)*4 ! обязательно с

1) 3/4 + 5/6 = 9/12 + 10/12 = 19/12
2) (1)1/2 - 3/5 = 3/2 - 3/5 = 15/10 - 6/10 = 9/10
3) 1 - 7/8 = 8/8 - 7/8 = 1/8
4)19/12 : 9/10 = 95/54
5) 95/54 *(1)8/19 = 95/54 * 27/19 = 5/2
6) 1/8 * 4 = 1/2
7) 5/2 - 1/2 = 4/2 = 2