1分数单位是 ,它里面有 个这样的分数单位,再给它加 个这样的分数单位就正好是最小的质数.
1﹣1× =0÷ == : =75%
: =0.125= %==.
9÷ == :8=0.75= %= 折.
=0.375= ÷24= %
:20==0.8=12÷ = %.