2.31÷0.3=7.7
0.8x0.25x0.4x12.5 4.58?2.5?0.4 都简便计算过程哪缓具李迟模体旦陪 0.8x0.25x0.4x12.5 =（0.8*12.5）*（0.25*0.4） =10*0.1 =1 4.58?2.5?0.4 =4.58÷（2.5*0.4） =4.58÷1 =4.58
