一元二次方程是初中代数的重要内容之一,应用得较多的知识是一元二次方程的求根公式、根的判别式和根与系数的关系,实际解题时,还常常需要与其他数学知识综合运用,涉及面很广,如整数的性质,平面几何知识,以及构造一元二次方程解题等等,下面举例介绍这几方面的应用. The one-level quadratic equation is one of the important contents of junior high school algebra. The more applied knowledge is the root formula of the quadratic equation, the discriminant of the root, and the relationship between the root and the coefficient. When the actual problem is solved, it often needs to be compared with other. The comprehensive application of mathematics knowledge covers a wide range of topics, such as the nature of integers, knowledge of plane geometry, and the construction of quadratic equation solving problems. The following examples describe the application of these aspects.