1里有 个0.25,0.5的3.2倍是 .
9.8﹣3.2﹣0.8= ﹣( + ) 12.56+9.85+7.44=( + )+ .
(2.5+3.5)× = × + ×4.
1.25×(m+8)=1.25m+10 .
31×25×4=31×( × )
18.25+6.2+1.75=6.2+( + ),根据的运算定律是 .