1/2=0.5,；2/2=1；1/3=0.3334；2/3=0.6667；3/3=1；1/4=0.25；2/4=0.5；3/4=0.75；4/4=1；1/5=0.2；2/5=0.4；3/5=0.6；4/5=0.8；5/5=1；1/6=0.1667；2/6=0.3334；3/6=0.5；4/6=0.6667,5/6=0.8334；6/6=1；1/7=0.1429；2/7=0.2858；3/7=0.4286；4/7=0.5715；5/7=0.7143；6/7=0.8572；7/7=1；1/8=0.125；2/8=0.25；3/8=0.375；4/8=0.5；5/8=0.625；6/8=0.75；7/8=0.875；8/8=1；1/9=0.1112；2/9=0.2223；3/9=0.3334；4/9=0.4445；5/9=0.5556；6/9=0.6667；7/9=0.7778；8/9=0.8889；9/9=1有几个保留错的