把下列算式按得数的大小,从大到小排序.500﹣222 278+628 275+225 906﹣345 .
:24=== ÷16= %
= :35=5:7= ÷21=.
== ÷20=6: = %= 折.
÷15=0.8== %= 折.
1﹣1× =0 ÷ == : =75%