如题 Find the mass of the cone z=(x^2+y^2)^0.5 ,where x^2+y^2 小於等於 4 and the density function is δ(x,y,z)= x^2+y^2 一整个没头绪要怎麽解阿 再请各位前辈帮帮忙 也多谢各位前辈的指教 感恩^^ --

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