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定理如图1,在△ABC中,D为BC上的任意一点,E为AD上的任意一点,若 BD:DC=m:n,则有证明略.下面介绍它在解题中的应用.1.求线段的比图1
Theorem is shown in Fig. 1. In △ABC, D is any point on BC, and E is any point on AD. If BD:DC=m:n, there is proof. The following describes its application in problem solving. 1. Find the ratio of the line segment 1