从一升酒精中倒出升,然后又加等量的水,这时容器内酒精与水的体积一定相等. .
填上适当的数:=5÷3==16÷8==== ÷20.
= :40=12: = %= (小数)
= ÷15== %
6÷ =0.375= :40== %
9÷ =0.6= :60═ %