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在概念教学中,不仅要用肯定例证的变式,也要运用否定例证,即反例,从正、反两方面促进概念的形成。反例,就是故意变换事物的本质属性,使之质变为它事物。在引导思辨中,从反面突出事物的本质属性,准确深刻地理解概念。初步形成的知识巩固程度较差,容易向邻近的知识泛化,此时,教师恰当地提供典型反例,可以使错误“防患于未然”,将错误消灭在萌芽状态。然而,反例的运用要注意形式与时机。本文就如何结合教学内容,谈谈反例呈现
In the concept teaching, we should not only use the positive examples of the variant, but also use the negative examples, that is counterexamples, to promote the concept of positive and negative aspects of the formation. Counterexamples, that is, deliberately changing the essential properties of things, make them qualitative things. In guiding speculation, it highlights the essential nature of things from the opposite side and accurately and profoundly comprehends the concepts. The initial formation of knowledge consolidation is poor, easy to generalize to neighboring knowledge, this time, teachers properly provide typical counter-examples, you can make the error “take preventive measures” to eliminate the mistakes in the bud. However, the use of counter-examples should pay attention to the form and timing. This article on how to combine teaching content, talk about counterexamples