真分的倒数都比1大,假分数的倒数却一定不比1小. .
== ÷16= (小数)
5:8= %;0.25的倒数是 .
4÷5==20÷ = (填小数)
=28: =0.8= ÷10= %= .
=9: = ÷20== %