4的分数单位是 ,原数去掉 个这样的分数单位,就变为最小的质数.
:24==12÷ =.
0.75==18÷ =÷ .
%= ÷30== (填小数)= 折.
= ÷ =0.8= %= :10.
=65%= ÷20=26: = (小数)