试题与答案

设抛物线y2=2px(p>0)的焦点为F,其准线与x轴交于点C,过点F作它的弦A

题型:填空题

题目:

设抛物线y2=2px(p>0)的焦点为F,其准线与x轴交于点C,过点F作它的弦AB,若∠CBF=90°,则|AF|-|BF|=______.

答案:

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