0.6:的比值是 ,(0.6×2):(×2)的比值是 ,如果比值不变,后项变成0.5,则前项应是 .
=0.75=( )÷8( )%=24:( )
= :0.8=0.75= ÷12= %.
: =6÷( )==0.75.
== ÷10= 小数= :25.
0.25== ÷ =.