设抛物线y^2=4x的焦点为F,其准线方程与x轴交于点C,过点F作它的弦AB,若角CBF=90度,则|AF|-|BF|的长为多少?
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![设抛物线y^2=4x的焦点为F,其准线方程与x轴交于点C,过点F作它的弦AB,若角CBF=90度,则|AF|-|BF|的长为多少?](/uploads/image/z/2763585-9-5.jpg?t=%E8%AE%BE%E6%8A%9B%E7%89%A9%E7%BA%BFy%5E2%3D4x%E7%9A%84%E7%84%A6%E7%82%B9%E4%B8%BAF%2C%E5%85%B6%E5%87%86%E7%BA%BF%E6%96%B9%E7%A8%8B%E4%B8%8Ex%E8%BD%B4%E4%BA%A4%E4%BA%8E%E7%82%B9C%2C%E8%BF%87%E7%82%B9F%E4%BD%9C%E5%AE%83%E7%9A%84%E5%BC%A6AB%2C%E8%8B%A5%E8%A7%92CBF%3D90%E5%BA%A6%2C%E5%88%99%7CAF%7C-%7CBF%7C%E7%9A%84%E9%95%BF%E4%B8%BA%E5%A4%9A%E5%B0%91%3F)
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