1.25乘78+1.25的简便计算解:采用分配律,原式=1.25x78+1.25=1.25x(78+2)-1.25=1.25x80-1.25=100-1.25=98.75
1.25乘78+1.25=1.25×(78+1)=1.25×(80-1)=1.25×80-1.25×1=100-1.25=98.75
1.25*78+1.25=1.25*79=1.25*80-1.25=100-1.25=98.75