А) 27999-(47502:78+422)*19 = 27999-(609+422)*19 =
=27999-1031*19 = 27999-19589 = 8410.
б) (125,8-2,72(37,96:7,3+2,04:17))*0,25 =
= (125,8-2,72(5,2+0,12)) = (125,8-2,72*5,32)*0,25 =
= (125,8-14,4704)*0,25 = 111,3296*0,25 = 27,8324.
в) 2 3/8 + (5 3/7 - 1 3/7) + 3 5/8 = 2 3/8 + 4 + 3 5/8 = 10.