58.987缩小到原来的是 ,4.985扩大到原来的1000倍是 .
9: == ÷ =0.6.
:56==12÷ =.
6: ==3:4=15÷ = 小数.
8: ==4:5=20÷ = 填小数.
= ÷ == 填小数= 折.