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如何理解点差法
更新时间: 2020-10-13 00:00:00  

是在求解圆锥曲线并且题目中交代直线与圆锥曲线相交被截的线段中点坐标的时候,利用直线和圆锥曲线的两个交点,并把交点代入圆锥曲线的方程,并作差。求出直线的斜率,然后利用中点求出直线方程。

是解决椭圆与直线的关系中常用到的一种方法。

关键词: 如何 理解

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