化归思想是数学中最重要、最基本的思想之一,它揭示联系实现转化,在迁移转化中,让问题规范化,且覆盖面广,其几乎贯穿于整个高中数学,如何求函数最值是高中的重点内容,在高中数学练习、习题中,及其高中毕业会考题中、高考题中出现的频率很高,且函数表达式的形式多种多样。 The idea of ​​returning to normalization is one of the most important and basic ideas in mathematics. It reveals that the transformation of the connection is realized. In the process of transformation and transformation, the problem is standardized and has a wide coverage. It almost runs through mathematics in the whole high school. The key content, in high school math exercises, exercises, and its high school graduation exam questions, the high frequency of occurrence in the college entrance examination questions, and the function of a variety of forms of expression.