解析几何中，直线系的要点是什么？ - 知乎
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其实很简单 首先假设两个直线不平行（也不重合，否则没啥意义） 首先直线系固定一个系数λ是一条过两直线交点的直线 1：过两个直线的交点 由于两个直线的交点坐标是 A1x＋B1y＋C1=0与A2x＋B2y＋C2=0的解； 这样把解带入A1x＋B1y＋C1＋λ (A2x＋B2y＋C2)＝0显然满足 2:解析式是一条直线 A1x＋B1y＋C1＋λ (A2x ...
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