一个圆柱的体积是75.36立方厘米.它的底面直径是4厘米,这个圆柱的高是 .
6÷ =0.4== %.
=10÷ == : .
8÷ === ÷20= %
=== ÷ = (小数)
=21÷ = %== (填小数)