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转化思想是一种重要的数学思想,代数中的换元法又是一种重要的转化方法.课本中对换元法没有要求,属于非考查内容.这样,类似的内容就被作为考查学生阅读理解
The idea of transformation is an important mathematical idea. The law of substitution in algebra is also an important method of conversion. There is no requirement for the law of substitution in textbooks and it is not an examination content. In this way, similar content is used as a test for students to read. understanding