一个圆锥的体积是90cm,底面积是16cm2.它的高是 厘米.
20: =0.8==24÷ = %.
=8÷ = :20=0.25.
=15÷ = ÷30=七五折= %
6: == %= ÷32.
1.5=18÷ == :6= %