的分数单位是 ,再添 个这样的单位就是最小的素数.
÷20=6: == %= 成=0.15.
:16==24÷ = %
9÷ = :48=0.75= %= 折数.
:12=6÷ = 填小数= 折=75%.
=0.4==12÷ = %= :25.