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在进年来的各地高考题压轴题中,多次出现同一函数中的两个独立变量问题,此类问题具有难度大、技巧性强,两个变量之间的相关性和任意性难以把握等特点,致使考生无从下手,找不到解题的切入点.为此本文针对这类题目进行分类解析,给出常用的几种减少变量的“裁员”策略,仅供参考.策略1.进行消元—“裁一留一”题目中的两个变量之间隐含着某种等量关系,发现并利用这种等量关系可以将其中一个变量裁去,保留的变量应使所构造函数式结构简单为宜,再利用函数的性质解题.
In recent years, all over the college entrance examination questions in the axis, the same function appears in two independent variables problem, such problems with great difficulty, strong skills, the correlation between the two variables and arbitrariness is difficult to grasp and so on , So that candidates can not start, can not find a solution to the entry point.To this end, this paper classified analysis, given several commonly used variable reduction “layoffs ” strategy, for reference purposes only. There is some kind of equivalent relationship implied by the two variables in eliminating the element - “rule one by one ”, and finding and using one of these variables to cut off one of the variables can preserve the variable Constructor structure is simple and appropriate, the nature of the re-use function to solve the problem.