在3:4的前项加上6,要使比值不变,后项应加 .
== ÷ == (小数)
4÷5= :20=20÷ = %= 折= (填小数).
==24÷ == ←填小数.
0.75=9÷ ==18÷ =.
3:8== ÷ =12: = :24= 小数.