解决数学问题的关键在于恰当地转化，即将原数学问题转化成另一个较易解决的新问题，而转化的关键在于抓住问题的特征，并由此进行分析、变换、联想、构造．所谓特征，就是指能反映问题的条件与结论的内在联系的那些外形结构特点、数值特点、位置特点、差异特点等等．通过对问 The key to solving mathematics problems lies in the proper transformation, that is, transforming the original mathematics problem into another new problem that is easier to solve, and the key to transformation lies in seizing the characteristics of the problem and analyzing, transforming, associating, and constructing the problem. The so-called feature refers to the features of the external structure that can reflect the internal relationship between the conditions of the problem and the conclusion, numerical characteristics, location characteristics, differences characteristics, and so on. Through the question