比比谁是冠军?(把所用时间按从短到长的顺序排一排) < < < .
÷25=7: = 小数= %=5折.
4:5==36÷ = :30= (小数)= %= 折.
= :32=3÷8= %.
18: ==0.6=6÷ = %
:16=0.75== %