一根绳子长8米,剪去 米,还剩米;若剪去,还剩 米.
0.625== = ÷40=.
3:4= :12=12÷ == %
== ÷16= (小数)
5:8= %;0.25的倒数是 .
4÷5==20÷ = (填小数)