0.8+0.8+0.8+0.8用乘法算式表示是 ,0.4×0.3×0.25=0.3×(0.4×0.25)运用了乘法 定律.
:10= ÷5== %=0.6= 成= 折.
6÷ ==75%=18: = [填小数].
4: =80%= ÷15==1÷ = (写小数)
5:8= ÷16== %
=3:12= ÷4.