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高考数学常见题型之一,就是利用已知条件中的方程或者不等式求解某一变量范围,往往涉及两个或者多个变量,也就是涉及二元变量或多元变量的关系式,如果利用函数思想观点,将其中变量间进行角色互换,主元变次元,次元变主元,有时可将难于下手的问题转化成熟悉的简单问题,从而事半功倍,轻松获解,这对写好高三数学学案,提高复习课堂有效性是有很大帮助的!下面例说常见的主次元互换思想.一、解含参数的集合题
One of the common types of college entrance examination mathematics is to solve the range of a certain variable by using the equations or inequalities in known conditions, often involving two or more variables, that is, the relation involving binary variables or multiple variables. If we use the function idea From the viewpoint of changing the roles among the variables, the main variable becomes the sub-element and the sub-element becomes the main element, and sometimes difficult problems can be transformed into familiar simple problems, so that you can do more with less effort and get answers easily. , Improve the effectiveness of reviewing the classroom is of great help! The following example common primary and secondary exchange ideas. First, the set of parameters with the solution