1) 11,25 - 3 5/12 - 4,3 - 7 19/30 = 6,95 - 3 25/60 - 7 38/60 = 6,95 - 10 63/60 = 6,95 - 11 3/60 = 6,95 - 11,05 = - 4,1
2) 7 7/12 - 5 5/6 = 7 7/12 - 5 10/12 = 6 19/12 - 5 10/12 = 1 9/12
3) - 4,1 : 1 9/12 = - 41/10 : 21/12 = - 246/105 = - 2 36/105
Ответ - 2 36/105