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設中點M的座標是M(x,y) 因為M是P點與Q點的中點,所以P點的座標(2x-4,2y) P點在y=x²;上,所以: 2y=(2x-4)²;=4x²;-16x+16 中點M的軌跡方程是:y=2x²;-8x+8
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