把16米长的绳子平均分成4段,每段占全长的 ,每段长 .
0.16==2÷ =8: = %
0.75==6÷( )=12:( )=( )%
0.25== :16=5÷ = %
:20=0.8=12÷ == %= (填成数)
= %= : = (小数)