已知点A(0,2) 抛物线y^2=2px 的焦点为F ,准线为l ,线段FA 交抛物线与点B ,过B作l的垂线,垂足为M,若AM⊥MF,则p=答案是根号2 我怎么算出M(-p/2,
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![已知点A(0,2) 抛物线y^2=2px 的焦点为F ,准线为l ,线段FA 交抛物线与点B ,过B作l的垂线,垂足为M,若AM⊥MF,则p=答案是根号2 我怎么算出M(-p/2,](/uploads/image/z/11475712-64-2.jpg?t=%E5%B7%B2%E7%9F%A5%E7%82%B9A%280%2C2%29+%E6%8A%9B%E7%89%A9%E7%BA%BFy%5E2%3D2px+%E7%9A%84%E7%84%A6%E7%82%B9%E4%B8%BAF+%2C%E5%87%86%E7%BA%BF%E4%B8%BAl+%2C%E7%BA%BF%E6%AE%B5FA+%E4%BA%A4%E6%8A%9B%E7%89%A9%E7%BA%BF%E4%B8%8E%E7%82%B9B+%2C%E8%BF%87B%E4%BD%9Cl%E7%9A%84%E5%9E%82%E7%BA%BF%2C%E5%9E%82%E8%B6%B3%E4%B8%BAM%2C%E8%8B%A5AM%E2%8A%A5MF%2C%E5%88%99p%3D%E7%AD%94%E6%A1%88%E6%98%AF%E6%A0%B9%E5%8F%B72+%E6%88%91%E6%80%8E%E4%B9%88%E7%AE%97%E5%87%BAM%EF%BC%88-p%2F2%2C)
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