一个圆柱的体积是75.36m3，与它等底等高的圆锥的体积是 m3．
0.35===（ ）÷（ ）=．
：20=3： =0.2== %
=== ÷12．
18÷ == ÷5= ．
=0.625==15÷ ．
=
=（ ）÷（ ）=
．
= %
=
=
= ÷12．
= ÷5= ．
=0.625=
=15÷ ．
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