对于比较复杂的几何图形,我们可以将其进行分解,取出其中对于解题有用的关键部分或基本图形,达到化难为易的目的.平行线分线段成比例定理可概括为两个基本图形,即“A”形与“X”形,如图1.它们在具体问题中有着广泛的应用.1.从较为复杂的图形中分解出基本图形 For more complex geometries, we can decompose them and take out the key parts or basic graphs that are useful for problem solving to achieve the goal of making it difficult to achieve. The proportional theorem of the parallel line dividing line segment can be summarized as two basic figures, namely “A” shape and “X” shape, as shown in Figure 1. They have a wide range of applications in specific problems. 1. Decomposing basic graphics from more complex graphics