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在几何解题中,某些简单的性质,往往能打开较为复杂的几何问题的大门.这里举一例如下.基本性质如图1,在ABC中,点D为
In the geometric problem solving, some simple properties, often can open the door to more complex geometric problems. Here is an example as follows. The basic properties shown in Figure 1, in ABC, the point D