50块饼,每盒装6块,需要准备9个盒子. .(判断对错)
== ÷16= (小数)
5:8= %;0.25的倒数是 .
4÷5==20÷ = (填小数)
=28: =0.8= ÷10= %= .
=9: = ÷20== %