关于曲顶柱体体积的题目,

问题描述:

关于曲顶柱体体积的题目,
以z=x^2+y^2为顶,XOY面D:x^2+y^2=0,y>=0为底的曲顶柱体体积为几
怎么算的?

体积=∫∫D [x²+y²]dxdy
=∫∫D p²·pdpdθ
=∫(0,π/2)dθ∫(0,1)p³dp
=π/2· p的4次方/4 (0,1)
=π/8