6□4÷6,要使商之间有0,□内可以填 .
2:5= :10=10÷ = (填小数)
0.4= : =10: = :35= %
=20÷ =8: =0.8= %= .
=3÷2=15: = %= (小数)
0.6=3: = ÷15= 成= %