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研究梯形的有关问题 ,常常是添一些辅助线 ,将梯形问题转化为三角形或平行四边形来解决 .现就常用的几种转化方法举例如下 :
To study trapezoidal problems, we often add some auxiliary lines to solve the trapezoidal problem into triangles or parallelograms. Here are some examples of commonly used transformation methods: