用导数的单调性与极值等知识求较复杂函数最值的方法,是无可厚非的通法,但它牵动的知识面广,方法灵活又多变,不仅运算量大,还时常伴随着苦涩的分类讨论.因此,用这种方法解答,学生入手容易深入难,容易出现“会而不对,对而不全”的情况,完整答题的效率很低.针对这一问题,本文换个思维角度,开辟一种新的途径,更换所需的知识 The method of using the knowledge of monotonicity and extremum of derivative to find out the most value of complex functions is a perfect method, but it has a wide range of knowledge and flexible and changeable methods. It is not only computationally intensive but also often accompanied by bitterness Therefore, it is very inefficient for the students to answer the questions in this way, which is easy for the students to start with, and is easy to appear “not right, but not right.” In response to this question, Open up a new way to change the required knowledge