0.53的计数单位是 ,它有 个这样的计数单位;把9.2改写成计数单位是0.001的小数是 .
=== ÷ = (填小数)
0.75==12÷ =.
4÷5==.
:16==62.5%=25÷ =.
÷4==0.75= %= : .