2,3 = 2 3/10 = 2 30/100
1,06 = 1 6/100
2,64 = 2 64/100
2 30/100*23/100 = 529/1000
1 6/100*23/100 = 1219/5000
2 64/100*23/100 = 759/1250
529/1000 = 2645/5000
759/1250 = 3036/5000
2645/5000+1219/5000 = 3864/5000
3864/5000-3036/5000 = 828/5000 = 207/1250