从给定几何条件确定函数关系式,一直是各地中考中引人注目的题型.解这类题许多同学感到困难.现以若干典型试题为例,谈谈这类试题解答的基本规律.让我们从一个简单的问题谈起. Determining the function relation from a given geometric condition has always been an attractive question in local exams. Many students who have solved this kind of question have difficulty. Now we will take some typical questions as an example to discuss the basic rules of answering such questions. We start with a simple question.