本文向大家介绍“带系数等积式”的一种新证法——系数变换法.根据比例的基本性质,将等积式改写成比例式,并将系数作适当变换,使之成为所求证比例式的内、外项或前、后项的系数,然后通过证三角形相似推出其结论.这种方法为证明及添置辅助线提供了丰富的信息,能很快找到证题的突破 This article introduces a new method of proof for the “coefficient with equal coefficients”—coefficient transformation method. According to the basic nature of the ratio, the equal product is rewritten into a proportional one, and the coefficients are appropriately transformed to make it become the proof. The proportional internal and external factors or the coefficients of the front and the back items are then used to draw conclusions similar to the proof triangles. This method provides a wealth of information for proving and adding auxiliary lines, and can quickly find breakthroughs in test items.