a÷b=4…0.3,若a和b都扩大8倍,商是 ,余数是 .
5÷20==4: = :12= %= (填小数)
÷20=12: ==0.8= %.
= : =15÷ ==0.6.
4÷5==== ÷80.
6÷ ===≈ .(保留三位小数)