近几年来,在初中数学竞赛中,常常出现几何问题用代数方法、代数问题联系图形来求解.几何问题,如果建立适当的直角坐标系,则可用代数方法处理;代数问题,如果能作出恰当的图形,也可以借助图形的性质来求解. In recent years, in the junior high school mathematics competition, there are often geometric problems with algebraic methods, algebraic problems and contact graphs to solve geometric problems. If an appropriate rectangular coordinate system is established, algebraic methods can be used; algebraic problems can be made if appropriate. Graphics can also be solved with the help of the nature of the graphic.