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笔者在文[1]和文[2]中提出“数学公式的教学应关注公式的来龙去脉”这一观点.具体而言,文[1]以“扇形面积公式”的教学为例,指出在公式教学中,推导公式、明确公式的意义以及公式的应用上要下功夫;文[2]以“等差数列前n项和”的教学为例,提出公式的推导要顺、公式的几何意义要明确、公式的应用要关注数学思想.本文就“公式的推导要顺”(或者更广泛地讲,是“数学教学要讲顺”)做进一步的叙述.
In the text [1] and [2], the author put forward the idea that the teaching of mathematical formula should pay attention to the ins and outs of the formula. Specifically, the text [1] takes the teaching of the formula of sector area as an example, It points out that in formula teaching, it is necessary to make efforts to deduce the formula, clarify the meaning of the formula and the application of the formula. In [2], taking the teaching of n items and The geometric meaning of the formula should be clear, and the application of the formula should pay attention to the mathematical thought.This paper further narrates the derivation of the formula “(or, more broadly, the teaching of mathematics”).