51,328/6,4-6,66/(8,2-6,72)
51,328:6,4-6,66:(8,2-6,72)=3,52 1) 8,2-6,72=1,48 2) 51,328:6,4=8,02 3) 6,66:1,48=4,5 4) 8,02-4,5=3,52