圆锥曲线求大神!已知一光线从点A(6,4)沿平行于x轴负方向射出,经抛物线y2=2px(p>0)两次反射后,再经直线x-y-7=0反射后又回到A点,则P=
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![圆锥曲线求大神!已知一光线从点A(6,4)沿平行于x轴负方向射出,经抛物线y2=2px(p>0)两次反射后,再经直线x-y-7=0反射后又回到A点,则P=](/uploads/image/z/6780440-56-0.jpg?t=%E5%9C%86%E9%94%A5%E6%9B%B2%E7%BA%BF%E6%B1%82%E5%A4%A7%E7%A5%9E%21%E5%B7%B2%E7%9F%A5%E4%B8%80%E5%85%89%E7%BA%BF%E4%BB%8E%E7%82%B9A%286%2C4%29%E6%B2%BF%E5%B9%B3%E8%A1%8C%E4%BA%8Ex%E8%BD%B4%E8%B4%9F%E6%96%B9%E5%90%91%E5%B0%84%E5%87%BA%2C%E7%BB%8F%E6%8A%9B%E7%89%A9%E7%BA%BFy2%3D2px%28p%3E0%29%E4%B8%A4%E6%AC%A1%E5%8F%8D%E5%B0%84%E5%90%8E%2C%E5%86%8D%E7%BB%8F%E7%9B%B4%E7%BA%BFx-y-7%3D0%E5%8F%8D%E5%B0%84%E5%90%8E%E5%8F%88%E5%9B%9E%E5%88%B0A%E7%82%B9%2C%E5%88%99P%3D)
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