一个数(0除外)除以0.1后,这个数缩小了10倍. .
1÷4==4: = %= (小数)
==6﹣ = ÷= 折.
:5=72: =18:15== % .
=0.3: = %= (填小数)= 折= 成.
:12= ÷8=0.75== %