Ответ:

3  1/6

Пошаговое объяснение:

(8:2 10/19-1 13/15•16/49):(3 1/12-1 25/36) =

= (8*19/48 - 28/15*16/49) : (37/12-61/36)=

=(19/6 - 64/105) : 25/18 = 133/42 = 3  1/6

Пошаговое объяснение:

1) 8 : 2 10/19 = 8 : 48/19 = 8 * 19/48 = 1 * 19/6 = 19/6 = 3 1/6

2) 1 13/15 * 16/49 = 28/15 * 16/49 = 4/15 * 16/7 = 64/105

3) 3 1/6 - 64/105 = 179/70

4) 3 1/12 - 1 25/36 = 3 3/36 - 1 25/36 = 2 39/36 - 1 25/36 = 1 14/36 = 1 7/18

5) 179/70 : 1 7/18 = 179/70 : 25/18 = 179/70 * 18/25 = 1611/875 = 1 736/875