8,1:0,4:2,7*3,06
10,2:2,4*12,5*0,8

8 1/10: 4/10:2 7/10* 3 6/100=81/4:2 7/10*3 6/100=15/2* 3 6/100=459/20

8,1:0,4:2,7*3,06=51/1258 1/10:4/10=81/10*10/4=81/42,7*3,06=8,2628 262/1000:81/4=8262/1000*4/81=102/250=51/12510,2:2,4*12,5*0,8=0,4252,4*12,5=3030*0,8=2410,2:24=0,425