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.%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。
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