把400﹣275,400+275,400﹣189,400+189这些算式按得数从大到小排一排 .
:20==0.8=24÷ =80%= 成= 折.
= ÷ ==.
÷8=== (填小数)
4÷5==8: = (填小数)= 折.
0.25== %= ÷ = : .