变式教学是认识问题本质、提高解题训练效果的较好途径之一,而条件变式则是变式教学的主要手段.在解题时,我们可以针对某一题目的条件进行合理变化,从而得到一组变式题,通过对数学问题进行多角度、多方面的变式探索和研究,从“变”中发现“不变”的本质,从“不变”的本质中探索“变”的规律,既可以减轻过重的课业负担,又可以达到举 Variant teaching is one of the better ways to recognize the essence of the problem and improve the effect of problem solving training, while the conditional variation is the main means of variant teaching.When the problem is solved, we can make reasonable changes to the conditions of a certain topic, Thus, a set of variant questions can be obtained. From the perspective of multi-angle and multi-variant exploration of mathematical problems, we find the essence of “unchanged ” from “change In essence, to explore ”change " law, can not only reduce the heavy burden of classwork, but also can be achieved