一个圆柱体的底面直径 4 分米,高 5分米,它的表面积是 ,体积是 .
12÷ =0.75= :32= :20= %= 折.
= :24== %
÷ ═==0.75= : .
= ÷12=18: =2.25=1= %.
=4: = ÷54= (填小数)