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面積元素ds=2/(4-x^2-y^2)^1/2dxdy ∫∫(x^2+y^2+z^2)dS=x^2+y^2+z^2)dS=∫∫4.2/(4-x^2-y^2)^1/2dxdy 極座標換元:∫∫(x^2+y^2+z^2)dS= 4πr^4=64π 細節問題自己處理.
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