周长相等的正方形和圆,其面积的比是 .
%=9÷ =0.375==24: =.
:===0.25.
35: =0.625= ÷ = × .
= (小数)= (百分数)=12: = 折.
1=20.4÷( )=2=3.4= :0.5.