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一元一次不等式(组)的题目中涉及到参数时,有些同学感到困难,本文通过对典型例题的分析,归纳总结出一元一次不等式(组)参数取值范围这种题型的解题方法,供同学们参考.例1已知不等式3x-a≤0的正整数解恰是1、2、3,则实数a的取值范围是.解析解原不等式得x≤a3.我们常用数轴来表示不等式(组)的解集,问题的关键是a3放在数轴的什么地方合适,下面就借助数轴分析a3的
One group of inequality (group) topics involved in the parameters, some students feel difficult. Through the analysis of typical examples, this paper sums up the unary inequality (group) parameter range of questions such as the problem-solving method for Students reference .Example 1 known inequality 3x-a ≤ 0 positive integer solution is exactly 1, 2, 3, then the real number a range of values is analytic solution original inequality x ≤ a3. We often use the axis to represent inequality (Group) solution set, the crux of the problem is a3 placed on the right axis where appropriate, the following on the number of axes with a3