圆锥体的底面半径扩大3倍,高不变,体积也扩大3倍. .
9÷ =0.75= :24= %= 折.
9÷ =0.75== :36= %
6÷ = /16=0.25= :4= %
25÷ =6: =0.5.
: == ÷20═ %