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設:P(x,y) AP=(x+3,y-8);BP=(x-7,y+4) 向量AP*向量BP=0 (x+3)*(x-7)+(y-8)*(y+4)=0 x^2-4x-21+y^2-4y-32=0 x^2+y^2-4x-4y-54=0 (x-2)^2+(y-2)^2=62 P點軌跡方程:(x-2)^2+(y-2)^2=62
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