0.4*100*30*62.5 =40*30*62.5 =75000 立方厘米 =75升
底x高=0.4m*30cm*62.5cm=75L
同上!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
0.4m=40cmV=abh=40*30*62.5=75000(立方厘米)=75升