计算416÷52时,把52看作 试商,商是 .
:32===6÷ = .
= :24=0.625=20÷ = .
比的前项是0.4,比值是,则比的后项是 .
=0.75= ÷12=1.8: = :24.
=0.8==16÷( )= 从左到右依次是 .