0.8x0.25x0.4x12.5 4.58➗2.5➗0.4 都简便计算过程具体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
