张景中先生认为:“一种方法解很多题,要好过很多方法解一个题.”这“一种方法”绝不是技巧性强、灵机一动的妙法,而应是最基本、最重要、最自然的通法.下面结合具体题目谈谈如何通过旋转变换,对条件进行整合,探求通法解一类题的方法. Mr. Zhang Jingzhong thinks: “One way to solve many problems is better than many ways to solve one problem.” This “one method” is by no means a skillful one with the most inspiration and inspiration but the most basic and important one , The most natural pass law. The following combination of specific topics talk about how to transform through rotation, the conditions for integration, to explore common method of solving a problem.