384402读作:三十八万四千四百零. (判断正误)
÷=; ÷=.
因为A×B=1,所以A=,B=.(A、B≠0) .
÷7=÷ =38.
× =× = ×= ×0.1=+ = ﹣.
× =× =+ =1.5× =× =1.