□27÷5,要使商的最高位在十位上,□里最大填 ;要使商是三位数,且中间有0,□里应填 .
:35=18÷ ==O.4= %
=12÷ == :24= %
6÷ ==37.5%=12: =.
=12÷ =0.25=4: = %
1÷4==4: = %= (小数)