圆柱形木料长1.8米,把它锯成3段,表面积增加了16平方米,原来这根木料的体积是 .
÷5== =0.6=15÷ .
==0.25==.
15: ==36÷ = %
0.6== : = ÷ .
12÷ ==0.375= :24.