14-1214--12=9∈A1414 ...n14/9^n-12]
问题描述:
14-1214--12=9∈A1414 ...n14/9^n-12]
答
b14 c14-bc≥14bc-bc=bc>.即x=1214y=1414时
14-1214--12=9∈A1414 ...n14/9^n-12]
b14 c14-bc≥14bc-bc=bc>.即x=1214y=1414时