5米长的绳子,截成米长的小段,可以截成( )段,每段占全长的( )。
5:13==1.2: .
9÷ =0.6= :20=30: .
= :15==6÷ = (填小数)
:8=15÷ ==9: .
==12÷ = :20= (小数)