“负负得正”理解模型的有效性分析

Efficiency Analysis of the Two-Negatives-Make-a-Positive Understanding Model

将先行各种版本的初中数学教材中,关于"负负得正"的理解模型分为四种类型:类比模型、归纳模型、演绎模型和情境解释模型;从学习者的角度,分析了这四种模型在帮助学生理解"负负得正"过程中的有效性,并由此提出了一种新的"负负得正"的理解模型.

Analysis of the many current middle school mathematics textbooks in use finds that the understanding models concerning the concept of ＂two negatives make a positive＂ fall into four categories： the analog model; the inductive model; the deductive model and the situational expository model. From the learners ＇ perspective, an efficiency analysis is made into the four models in the process of helping students understand the concept of ＂two negatives make a positive＂, thus to put forward a new understanding model for the comprehension of the concept.