圆柱体的体积比圆锥体的体积大2倍. .
7÷ = :12=== (小数)= %
0.375= :8==6÷ = %
=4÷5=32: = %= 折.
=10÷ = ÷0.3=.
==12÷ =≈ (保留两位小数).