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在小学数学中,除了运算是数学的基本方法之外,推理也是常用的数学方法。无论是低年级的找规律、总结计算法则,还是高年级的公式推导,无不用到推理的思想方法。现以二年级下册中的推理“例1:有语文、数学和品德与生活三本书,下面三人各拿一本。小刚拿的是什么书?小丽呢?”为例,谈谈如何让学生用自己喜欢的方式体验推理过程。一、在语言叙述中感受选言推理的雏形选言推理,分为相容选言推理和不相容选言推理。这里说的是不相容选言推理:大前提是个不相容的选言判断,小前提肯定其中一个选言支,结论则否定其他选言支;小前提
In elementary mathematics, in addition to arithmetic is the basic method of mathematics, reasoning is also commonly used mathematical method. Whether it is looking for the law of the lower grades, summed up the calculation of the law, or the formula derived from the higher grades, all without thinking method of reasoning. Now in the second grade under the inference “” Example 1: There are languages, mathematics and character and life of three books, each of the following three to take a. What is the book Xiaogang? Mary? “” As an example , Talk about how to make students experience the reasoning process the way they like. First, in the language of narration to understand the prototype eloquence reasoning prepositions, divided into compatible eloquence of reasoning and incompatible eloquence of reasoning. Here is the incompatible preamble reasoning: the premise is an inconsistent choice of judgment, a small premise affirmed one of the electoral support, the conclusion denied the other electoral support; small premise