(1)
1) 4 5/12 - 5 5/6 = 4 5/12 - 5 10/12 = -1 5/12
2) 13 4/5 + 7 1/2 = 13,8 + 7,5 = 21,3
3) -1 5/12 + 21,3 = 21 3/10 - 1 5/12 = 21 18/60 - 1 25/60 = 20 78/60 - 1 25/60 = 19 53/60
ответ: 19 53/60
----------------------------------------------
(2)
1) 3/4 : 5/6 = 3/4 * 6/5 = 9/10
2) 2 1/2 * 2/5 = 5/2 * 2/5 = 1
3) 1 : 1 1/9 = 1 * 9/10 = 9/10
4) 9/10 + 1 - 9/10 = 1
ответ: 1
=================================