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設A(X1,Y1)B(X2,Y2)直線方程Y=-2X+B Y1^2=4X1⑴Y2^2=4X2⑵作差,變形得:(y1-y2)/(x1-x2)=4/(y1+y2)=-2 y1+y2=-2 Y=-2X+B Y^2=4X聯立起來得:4x^2-8x+B^2=0 X1+X2=2 Y1=-2X1+B Y2=-2X2+B將上式相加:Y1+Y…
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