著名数学家华罗庚指出,善于“退”,足够地“退”,“退”到最原始而不失去重要性的地方,是学好数学的一个诀窍。这段话道出了解数学题的一个重要策略。当学生遇到难题束手无策时,不妨教学生从简单的情况或从小一点的数入手,从中获得某些启示后,再来考虑原题的解,或从正面顺推解题困难时,可以尝试从反面倒推等等。总之是为了把复杂的问题转化为基本形态问题上来。“退”是为了更好地 Hualang Geng, a famous mathematician, pointed out that being good at “retreat”, enough to “retreat” and “retreat” to the most primitive place without losing its importance is a knack for learning math. This passage is an important strategy for understanding math problems. When the students encounter problems at your fingertips, may wish to teach students from a simple situation or a small number of start, get some inspiration, and then consider the original solution, or from the positive problem-solving problem, you can try Side down and so on. In short, it is to convert complex problems into basic morphological problems. “Back” is for better