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坐标平面上点的运动引发图形变化,常有相似三角形产生,当对应条件无明确要求时,须分类讨论.一、单动点牵出两个三角形相似。
The movement of the point on the coordinate plane triggers the change of the shape, and often similar triangles are generated, and when the corresponding conditions are not clearly defined, they must be classified and discussed.