34/65=2*17/5*13 ireductibila a/b=34/65
39/65=3*13/5*13= 3/5=a/b
13/1001=13/13*77=1/77=a/b
85/15=17/3=a/b
55/1133=5*11/11*103=5/103 care e ireductibila 103 nu se imparte la 5 deci a/b=5/103
5151/8585=51*101/85*101=51/85=3*17/5*17=3/5=a/b
(aici te poti verifica pe calculator 5151:8585=0,6=3:5=6:10=0,6)