方程曾经是数学特别是代数学的中心课题。在现行中学教材中,不仅有关于方程的专门章节,而且几乎在各个领域内都有它的应用。因此方程部分的教学应该得到加强。除了让学生熟练地掌握有关方程的专门知识和技能外,还必须使学生善于应用方程概念,以期能够把一些看来与方程关系不大的问题,有意识地转化为方程的问题,从而比较顺利地解决。一、求值从方程角度看,要求某个特定的值,只要先建立关于它的方程(组),并解这个方程(组),就可以达到目的,至于如何建立有关的方程(组),必 Equations used to be the central subject of mathematics, especially algebra. In the current middle school textbooks, there are not only specialized chapters on equations but also their applications in almost every field. Therefore, the teaching of the equation should be strengthened. In addition to familiarizing students with specialized knowledge and skills about equations, students must also be good at applying the notion of equations in the hope of being able to consciously convert some of the problems that appear to have little to do with equations to problems of equations, solve. First, the value from the perspective of the equation, require a specific value, as long as the first establishment of its equation (group), and solution of this equation (group), you can achieve the goal, as to how to establish the relevant equations (groups) must