把1.81扩大到它的10倍后,再缩小到十分之一,结果是0.181. .
4:5==36÷ = :30= (小数)= %= 折.
= :32=3÷8= %.
18: ==0.6=6÷ = %
:16=0.75== %
3÷8=15: = %= 折.