3.14×0.1○3.14 0.8÷0.98○0.980.14÷0.1○3.14 0.45×0.45○0.45.
既可看作分数,也可看作比. .
=24÷ = :36=0.75= %= 折.
÷25=0.8=16: = %= 折.
7÷2.5==8: = %; 千米= 米.
:16== ÷20=0.25= %、