把一根3米长的铁丝平均分成8段,每一段长是这根铁丝的,每段长米.
÷4==0.25= :8.
=9÷ = :8== (填小数)
3: ==15÷ = ×= (小数).
5÷20==4: = :12= %= (填小数)
÷20=12: ==0.8= %.