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过抛物线y2=2px(p>0)的焦点F作 一直线交抛物线于A、B两点,若线段AF与 FB的长分别为a、b.则
The focus F passing over the parabola y2=2px (p>0) is a straight line intersecting the two points A and B. If the lengths of the AF and FB segments are a and b, then