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中考试卷中总有这样特征的一类选择题:一个动态的几何图形:四个选项是图形运动中的函数图象.解这类选择题的关键是看准变量表示的实际意义,探求两个变量之间的函数关系,并根据实际情况确定自变量的取值范围,进而在一般性的基础上探求符合条件的特殊性.下面举例说明:
There is always a type of multiple choice question in the examination paper: a dynamic geometry: the four options are the function images in the graphic motion solution. The key to solving this type of multiple choice questions is to look at the actual meaning of the variable representation and to explore two According to the actual situation to determine the range of independent variables, and then explore the general conditions based on the particularity of the following example: