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令x=rsinψcosθ,y=rsinψsinθ,z=rcosψ那麼∫∫∫√(x²;+y²;+z²;)dxdydz=∫∫∫(r*r²;sinψ)drdψdθ=∫∫∫(r³;sinψ)drdψdθ積分區域:由x²;+y²;+z²;≤x得:0≤r≤sinψcosθ0…
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