函数的单调区间表示方法初探

单调性是函数的一个重要性质，也是数学应用的重要方面，但在教学实践中单调区间的边界表示却比较混乱，为此，本文对涉及单调性教学几个阶段的教科书内容进行了比较，提出自己的一点看法。

A Preliminary Exploration on Methods of Expressing the Monotonic Interval of Function

Monotonicity is an important property of function, also is an important aspect of mathematics application, but in teaching practice, the expression of the monotonic interval boundary is a bit confusing. Therefore, the writer compares the textbook con-tents at several stages involving monotonicity, and puts forward some personal views.