有分数,当a是 时,它是真分数;当a是 时,它是假分数;当a是 时,它的值是0.
= :20=75%
÷5.6=2÷ ==28: ≈ %.
=15÷ == (填小数)
=0.375= : =6÷ = %.
=8:10=48÷ = (填小数)