8➗4=2cm(水上升或下降1cm,圆钢长为2cm圆钢高:9✖️2=18cmV圆钢=兀r平方✖️高 =3.14x5x5x18 =1413cm2
(25*8π)/(4/9)=450π
【漂亮; 232323 23 23 23 = 111