论文部分内容阅读
在七年级数学解题过程中,去添括号作为解题的一个重要环节,对解题的结果的正确与否有着重要的关系。但在实际的学习中,部分学生对法则的不熟悉,或者错误运用,导致去括号或者添加括号时出现符号的错误,导致题目的错误。这些小小的错误导致整个题目的错误,非常的可惜,也严重挫伤了学生学习数学的积极性。针对这一普遍现象,笔者从广大学生的认知水平出发,对教材上去括号或者添加括号进行了深入的研究,想出了一个简单的口诀,可以帮助大家很快地记住去括号或者添加括号的法则。现与大家一起分享。去添括号有口诀:前为正,不变号;前为负,全变号。
In the seventh grade mathematics problem solving process, to add parentheses as an important part of the problem solving, the correctness of the results of the problem has an important relationship. However, in actual learning, some students are unfamiliar with the law or mistakenly applied, which leads to errors in the opening or closing of brackets or the addition of parentheses, which leads to errors of the title. These small mistakes led to the entire subject of the error, a very pity, but also seriously dampened the enthusiasm of students to learn mathematics. In response to this common phenomenon, the author from the cognitive level of the majority of students, the text on parentheses or parentheses carried out in-depth study came up with a simple formula, can help you quickly remember to bracketed or add braces The law. Now share with everyone. Addition braces have formulas: before the positive, the same number; before the negative, the whole change.