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处理直线与圆锥曲线相交问题的一般技巧是先设出交点的坐标,但不求出,然后利用韦达定理和相关坐标将问题转化,这就是设
The general technique for dealing with the intersection of a straight line and a conic is to first set the coordinates of the point of intersection but not to find it and then to transform the problem using the Veda's theorem and the related coordinates,