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這個題目比較簡單,不用偏導數也能得出答案的. 曲面滿足x^2+y^2=1+z^2 點(x,y,z)到原點O的距離d滿足 d^2=x^2+y^2+z^2=1+2z^2 因為z可以取到0,所以d^2=1+2z^2>=1 dmin=1 最短距離是1
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