已知线段AB过y轴上一点P(0,m),斜率为k,两端点A、B到y轴距离之差为4k(k大于0 1.求以O为顶点,y为对称轴,且过A B两点的抛物线2.设Q为抛物线准线任意一点 过Q做抛物线的两切线 切点为M N 求证 直
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![已知线段AB过y轴上一点P(0,m),斜率为k,两端点A、B到y轴距离之差为4k(k大于0 1.求以O为顶点,y为对称轴,且过A B两点的抛物线2.设Q为抛物线准线任意一点 过Q做抛物线的两切线 切点为M N 求证 直](/uploads/image/z/3138878-38-8.jpg?t=%E5%B7%B2%E7%9F%A5%E7%BA%BF%E6%AE%B5AB%E8%BF%87y%E8%BD%B4%E4%B8%8A%E4%B8%80%E7%82%B9P%EF%BC%880%2Cm%29%2C%E6%96%9C%E7%8E%87%E4%B8%BAk%2C%E4%B8%A4%E7%AB%AF%E7%82%B9A%E3%80%81B%E5%88%B0y%E8%BD%B4%E8%B7%9D%E7%A6%BB%E4%B9%8B%E5%B7%AE%E4%B8%BA4k%EF%BC%88k%E5%A4%A7%E4%BA%8E0+1.%E6%B1%82%E4%BB%A5O%E4%B8%BA%E9%A1%B6%E7%82%B9%2Cy%E4%B8%BA%E5%AF%B9%E7%A7%B0%E8%BD%B4%2C%E4%B8%94%E8%BF%87A+B%E4%B8%A4%E7%82%B9%E7%9A%84%E6%8A%9B%E7%89%A9%E7%BA%BF2.%E8%AE%BEQ%E4%B8%BA%E6%8A%9B%E7%89%A9%E7%BA%BF%E5%87%86%E7%BA%BF%E4%BB%BB%E6%84%8F%E4%B8%80%E7%82%B9+%E8%BF%87Q%E5%81%9A%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E4%B8%A4%E5%88%87%E7%BA%BF+%E5%88%87%E7%82%B9%E4%B8%BAM+N+%E6%B1%82%E8%AF%81+%E7%9B%B4)
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