真分数的倒数一定大于1,假分数的倒数一定小于1. .
÷80=0.75= : == %= (填成数)
3: ===24÷ = %
10÷ == : = (小数)= %
:20==24÷ =80%
3:4==24÷ = %= .(填小数)