把如图所示的硬纸板沿虚线折叠成正方体,与C面相对的面是 .
÷3==15: .
24÷ = :30== %=0.4.
÷12=12:15= %= 小数.
=12: =× = ÷5=2.
÷ =20: ==0.8= %.