Question

( ( 85/6 . 83/2) / 810/6 )-2

Answer 1

I - ((85/6).(83/2)) = 7055/12
     810/6 = 135

II - (7055/12)/135 = (7055/12).(135/1) = 952425/12 = 317475/4

III - 317475/4 - 2 = (317475-8)/4 = 317467/4