小数点左边第一位是 ,它的计数单位是 ;小数点右边第一位是 ,它的计数单位是 ;这两个计数单位间的进率是 .
=0.25=4÷ = :28= %
12÷ ==== %= 折.
5: ==1.25=30÷ = %
1==3÷ = : = %= (填小数).
=2: =4÷ = %=0.4.