直线与圆锥曲线的关系,在线等~~已知直线y=k(x+2) (k>0)与抛物线C:y²=8x相交于A.B两点,F为C的焦点,若|FA|=2|FB|,则k等于多少?给我个过程.答案什么的可以忽略.给我一个很具体的过程就好了
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![直线与圆锥曲线的关系,在线等~~已知直线y=k(x+2) (k>0)与抛物线C:y²=8x相交于A.B两点,F为C的焦点,若|FA|=2|FB|,则k等于多少?给我个过程.答案什么的可以忽略.给我一个很具体的过程就好了](/uploads/image/z/13975695-63-5.jpg?t=%E7%9B%B4%E7%BA%BF%E4%B8%8E%E5%9C%86%E9%94%A5%E6%9B%B2%E7%BA%BF%E7%9A%84%E5%85%B3%E7%B3%BB%2C%E5%9C%A8%E7%BA%BF%E7%AD%89%7E%7E%E5%B7%B2%E7%9F%A5%E7%9B%B4%E7%BA%BFy%3Dk%28x%2B2%29+%28k%3E0%29%E4%B8%8E%E6%8A%9B%E7%89%A9%E7%BA%BFC%3Ay%26sup2%3B%3D8x%E7%9B%B8%E4%BA%A4%E4%BA%8EA.B%E4%B8%A4%E7%82%B9%2CF%E4%B8%BAC%E7%9A%84%E7%84%A6%E7%82%B9%2C%E8%8B%A5%7CFA%7C%3D2%7CFB%7C%2C%E5%88%99k%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91%3F%E7%BB%99%E6%88%91%E4%B8%AA%E8%BF%87%E7%A8%8B.%E7%AD%94%E6%A1%88%E4%BB%80%E4%B9%88%E7%9A%84%E5%8F%AF%E4%BB%A5%E5%BF%BD%E7%95%A5.%E7%BB%99%E6%88%91%E4%B8%80%E4%B8%AA%E5%BE%88%E5%85%B7%E4%BD%93%E7%9A%84%E8%BF%87%E7%A8%8B%E5%B0%B1%E5%A5%BD%E4%BA%86)
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