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∫∫(x^2+y^2+z^2)^-0.5ds =∫∫ads =a*(2πa²;) =2πa³; 曲面積分可以用曲面方程化簡被積函數;被積函數為1,積分結果為曲面面積;球表面積為4πa²;,本題由於z>0,囙此只是半個球,所以是2πa²;
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