把一块15.7cm 宽8cm，高5cm的长方体铝锭和一块底面直径是6cm,高24cm的圆柱体铝锭，熔铸成一个底面半径8cm的圆锥体铝锭，能铸多高？15.7x8x5=628立方厘米6÷2=2厘米3.14x2x2x24=301.44立方厘米628+301.44=929.44立方厘米3.14x8x8=200.96平方厘米929.44x3÷200.96=13.875厘米能铸13.875厘米高
