在求有关字母的值、点的坐标及其它计算、求值类的函数综合问题中,设出一个或两个点的坐标,就可表示出其它相关点的坐标,进而表示出相关线段的长或函数的解析式,然后根据函数的性质或题中或明或暗的等量关系列出方程求解,是一个行之有效的方法.下面通过三个中考题的解析来说明. Find the coordinates of one or two points in the comprehensive function of the value of the letter, the coordinates of the point and other calculation, evaluation of the class, you can show the coordinates of other related points, and then shows the length of the relevant line segment Or analytic function, and then listed according to the nature of the function or the problem of equal or dark equivalence relations equation solution, is an effective method.Three by the analysis of the three test questions to illustrate.