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一、λ的范围及其几何意义我们知道,定比λ=(P_1P)/(PP_2)。表示的是P点分有向线段P_1P_2的(分点P的)比,其几何意义是: 1.当λ>0时.P点位于P_1、P_2之间; 2.当-1<λ<0时,P点在P_2P_1的延长线
1. The range of λ and its geometrical significance We know that the ratio λ = (P_1P)/(PP_2). Shows the ratio of the P point to the directed segment P_1P_2 (point P). The geometric meaning is: 1. When λ>0, the P point is between P_1 and P_2; 2. When −1<λ<0. When the P point is on the extension line of P_2P_1