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設動弦中點坐標是A(x,y) 則A與圓心O(0,0)連線AO必垂直於AP AP的斜率是:(y-2)/(x-1) AO的斜率是:(y-0)/(x-0) 所以:[(y-2)/(x-1)][(y-0)/(x-0)]=-1 y(y-2)+x(x-1)=0 x²+y²-2y-x=0,此即動弦中點的軌跡方程
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