=3.2/0.8-3.2*0.8=3.2*(1/0.8)-3.2*0.8=3.2*(1/0.8-0.8)=3.2*《(1-0.8)/0.8》=3.2*(1/4)=0.8
这样
3.2÷0.8-0.8×3.2
=3.2×1.25-0.8×3.2
=3.2×(1.25-0.8)
=3.2×0.45
=16/5×9/20
=(16×9)/100
=144/100
=1.44
4÷0.8-0.8÷4 =40÷8-1.6÷8 =(40-1.6)÷8 =38.4÷8 =4.8 不如直接算 4÷0.8-0.8÷4 =5-0.2 =4.8 =4*5/4-4