把底面直径2厘米,高3厘米的圆柱内挖去两个分别以圆柱为底面,共顶点的圆锥,所得几何体体积是多少立方厘米?

圆柱体积-圆锥体积*2
= 派r^2*H-(1/3)派r^2*h *2
= 派*r^2*[H-(2/3)h]
= 派*r^2*[H-(2/3)(H*1/2)]
= 派*r^2*H[1-1/3]
= (2/3)*派*r^2*H
= (2/3)*3.14*1^2*3
= 6.28(立方厘米）