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本文以有附加条件的排列组合为例,谈谈如何用导学式教学法开拓学生的思维问题。对于有附加条件的排列组合问题,历来都是学生学习的难点。主要原因是此问题较抽象,解题的思维方法和以前的学习有所不同;解得结果数字较大,不便检验。学生考虑这类问题常常出现重复和遗漏的错误。我采用了“提出问题——引导讨论——归纳小结——推广练习”的教学过程,收到了举一反三的效果。具体作法介绍于后:一、问题:教师给学生提出研究的问题是什么,
This article takes the permutations and combinations with additional conditions as an example to talk about how to use lead-in teaching methods to open up students’ thinking problems. The problem of arrangement and combination with additional conditions has always been a difficult task for students. The main reason is that this issue is more abstract, and the way of thinking of solving problems is different from that of previous studies; Students often repeat and miss mistakes when considering such issues. I adopted the teaching process of “problem-guidance discussion-induction summary-practice promotion exercise” and received the effect of inferring from it. Specific practices are introduced later: First, the question: What is the teacher’s question for the student?