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作为初学不等式与不等式组的七年级学生而言,是否在庆幸不等式(组)与方程(组)的概念、解法、解应用题等方面有着诸多相似点的同时,又在因为不等式(组)中题型的“多”而“难”而苦恼呢?甚至有些题目是老师反复地讲学生却反复地出错呢?笔者在教学实践中把多数学生不易掌握的题目进行了分析和整理,将不等式(组)的典型题目(基础题本文不作考虑,如不等式与不等组的解法及列不等式与不等式组解简单应用题等)分类如下:一、根据含有字母已知数的方程(组)中解的情况,求该字母的取值范围。注:本文的“字母已知数”是指可以将该字母看作已知数的意思。
As a seventh grade student who is a beginner inequality and inequality group, whether there are many similarities in the concept, solution and application of the equation (group), there are many similarities between the fortunate inequality (group) and inequality group Problem “ ” And “difficult ” distress? Even some questions are repeated teacher repeatedly but the teacher made mistakes? The author in the teaching practice most students difficult to grasp the subject were analyzed and arranged , The typical problems of the inequality (group) are not considered (the text of the basic topic is not considered, such as inequality and inequality solutions and simple inequalities and inequality solutions, etc.) are classified as follows: First, according to the equation containing the known number of letters Group) solution of the situation, find the value of the letter range. Note: The meaning of “letter known” in this article means that the letter can be treated as a known number.