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一元一次不等式组是初中数学的一个重要内容,然而一元一次不等式组的解集的确定教材里只讲了用数轴来确定,这种方法对于不等式组中未出现待定字母时容易求解.一旦不等式组中出现了待定字母,学生是感到束无手策的,本文举例说明如何用口诀法来求一元一次不等式组中待定字母的值.一元一次不等式组解集是指不等式组中几个一元一次不等式解集的公共部分.利用数轴来确定虽然直观,但也有不足之处,然而利用它我们可以得出下面“口诀”.
The unitary inequality group is an important part of junior high school mathematics, however, the determination of the solution set for a unitary inequality group only speaks about the number axis. This method is easy to solve when there are no undetermined letters in the inequality group. Once the inequality group In which there are undecided letters and the students feel that they have no way to deal with the problem.This article gives an example of how to find the undetermined number of letters in the inequality group using the formulas of the formulas.Univariate inequality group The univariate inequality The common part of the solution set is to use the number of axes to determine although intuitive, but there are also deficiencies, but using it we can draw the following “formulas ”.