直线l经过抛物线y2=4x的焦点F,且与抛物线交于A、B两点,若向量AB=6向量FB,则直线l的斜率

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直线l经过抛物线y2=4x的焦点F,且与抛物线交于A、B两点,若向量AB=6向量FB,则直线l的斜率
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