20分之17 0.999.... 50分之127 0.41666... 0.675
0.85=17/209/8=1.1252.54=2 27/505/12≈0.41727/40=0.675
0.4=2/50.26=13/500.125=1/820分之7=0.3540分之9=0.22515分之2=≈0.133
0.58=29/501.24=16/2517/15≈1.4675/16=0.3缉籂光饺叱祭癸熄含陇1259/8=1.125