简便计算13.65-(12.73-1.35)=13.65-12.73+1.35=(13.65+1.35)-12.73=15-12.73=2.27
13.65+1.35-12.73=2.27
13.65+1.35-12.7315-12.732.27
13.65-(12.73-1.35)=13.65+12.73-1.35=13.65-1.35+12.73=13.3+12.73=26.03
=13.65+1.35-12.73=15-12.73=2.27