=0.48*（100-1）
=0.48*100-0.48
=48-0.48
=47.525.89*0.5*4*0.5简便计算怎么算5.89*0.5*4*0.5=5.89*0.5*2*2*0.5=5.89*(0.5*2)*(2*0.5)=5.89*1*1=5.89