直线l过抛物线的焦点并且与抛物线y^2=2px相交于A(x1,y1)和B(x2,y2)两点(1)求证4x1x2=p^2(2)求证对于这条抛物线的任何给定一条弦CD,直线l不是CD的垂直平分线
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![直线l过抛物线的焦点并且与抛物线y^2=2px相交于A(x1,y1)和B(x2,y2)两点(1)求证4x1x2=p^2(2)求证对于这条抛物线的任何给定一条弦CD,直线l不是CD的垂直平分线](/uploads/image/z/11533957-61-7.jpg?t=%E7%9B%B4%E7%BA%BFl%E8%BF%87%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E7%84%A6%E7%82%B9%E5%B9%B6%E4%B8%94%E4%B8%8E%E6%8A%9B%E7%89%A9%E7%BA%BFy%5E2%3D2px%E7%9B%B8%E4%BA%A4%E4%BA%8EA%28x1%2Cy1%29%E5%92%8CB%28x2%2Cy2%29%E4%B8%A4%E7%82%B9%281%29%E6%B1%82%E8%AF%814x1x2%3Dp%5E2%282%29%E6%B1%82%E8%AF%81%E5%AF%B9%E4%BA%8E%E8%BF%99%E6%9D%A1%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E4%BB%BB%E4%BD%95%E7%BB%99%E5%AE%9A%E4%B8%80%E6%9D%A1%E5%BC%A6CD%2C%E7%9B%B4%E7%BA%BFl%E4%B8%8D%E6%98%AFCD%E7%9A%84%E5%9E%82%E7%9B%B4%E5%B9%B3%E5%88%86%E7%BA%BF)
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