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如图1,过抛物线y2=2px(p>0)的焦点F作直线交抛物线于A、B两点,A、B在准线l上的射影分别为A′、B′,l交x轴于点P.这在抛物线部分是个很
As shown in Fig. 1, the focal point F of the parabola y2 = 2px (p> 0) makes a straight line to parabola at points A and B, and the projections of A and B on the line l are A ', B' At point P. This is a parabola part