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设抛物线C:y2=16x的焦点为F,过点Q(-4,0)的直线l与抛物线C相交于A...
设抛物线C:y2=16x的焦点为F,过点Q(-4,0)的直线l与抛物线C相交于A,B两点,若|QA|=2|QB|,则直线l的斜率k= .
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