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抛物線y²;=-8x設弦與抛物線交點A(x1,y1)B(x2,y2)則y1²;=-8x1y2²;=-8x2兩式相减y1²;-y2²;=-8(x1-x2)(y1-y2)(y1+y2)=-8(x1-x2)根據題意y1+y2=2設直線上任意一點為(x,y)則(y-1)/(x+1)=(y1-y2…
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