等价转化是把未知解的问题转化到已有知识范围内可解的问题的一种重要的思想方法.通过不断的转化,把不熟悉、不规范、复杂的问题转化为熟悉、规范甚至模式法、简单的问题.等价转化要求转化过程中前因后果是充分必要的,才能保证转化后的结果仍为原问题的结果. Equivalent transformation is an important way of thinking that transforms the problem of unknown solutions into solvable problems within the existing knowledge. Through continuous transformation, the unfamiliar, non-standard, and complex issues are transformed into familiar, normative, even patterns. Law and simple questions. Equivalent transformation requires that the antecedents and consequences in the transformation process are necessary and sufficient to ensure that the transformed results are still the result of the original problem.