0.4*1.35*2.5=(0.4*2.5)*1.35=1*1.35=1.35 0.45*0.2*50=0.45*(0.2*50)=0.45*10=4.5 3.5*2.01=3.5*(2+0.01)=3.5*2+3.5*0.01=7+0.035=7.035 1.45*6.5+0.55*6.5=(1.45+0.55)*6.5=2*6.5=13 6.12*99+6.12=6.12*(99+1)=6.12*100=612 5.9*101-5.9=5.9*(101-1)=5.9*100=590 0.8*0.8*125=0.8*(0.8*125)=0.8*100=80
用简便方法计算0.4乘1.35乘2.50.45乘0.2乘503.5乘2.011.45乘6.5加0.55乘6.56.12乘