5.903是由 个1, 个0.1, 个0.01, 个0.001组成的,它里面有 个0.001.
:12== ÷20= 用小数表示.
0.75= :8=15÷ =9: = %= 折.
:2= :5= %=24÷ .
0.375= ÷ = :16== %
27: =0.75== %