证明等积式或比例式是中考的重点之一。有些同学由于没有很好地掌握证明这种题的方法,在解题时,往往感到摸不清头绪,以致影响解题速度。本文向同学们介绍证明等积式或比例式的思考方法,供参考。1 化比例式寻找相似三角形 当没有射影定理或圆幂定理等积代换时,应考虑化比例式寻找相似三角形。这是大家比 Proving the isomorphism or ratio is one of the key points in the examination. Some classmates do not have a good grasp of the method of proving this kind of problem. When solving a problem, they often feel confused about the speed of the problem solving. This article introduces students to proofs of equal or proportional methods of thinking for reference. Finding similar triangles by using a proportional formula When there is no product substitution theorem such as the projective theorem or the circular power theorem, consider the proportional formula to find similar triangles. This is better than everyone else