一段方钢长1.5米,横截面是正方形,把它锯成相等的两段后表面积比原来增加18平方厘米,每段钢材的体积是 .
27: =0.75== %
== %= :12.
=3:4= %= 折= (填小数)
=4:5=8÷ = %
2: = ÷20=0.25== %