□378÷5当□里填 时,商是三位数,当□里填 时,商是四位数.
=8÷ = :20=0.25.
=15÷ = ÷30=七五折= %
6: == %= ÷32.
1.5=18÷ == :6= %
=3: = %= ÷20=0.75.