某些数学问题虽然本身不是一元二次方程的问题,但我们如果对问题的结构特征进行适当的联想,构造一个一元二次方程,然后再利用一元二次方程的有关性质(如一元二次方程根与系数的关系、根的判别式与一元二次方程有实数根的条件等)来解,往往可化难为易、化繁为简,收到事半 Although some mathematical problems are not themselves problems of the quadratic equation, if we properly associate the structural features of the problem, we construct a quadratic equation and then use the related properties of the quadratic equation (such as the quadratic equation Root and coefficient of the relationship between the root of the discriminant and the quadratic equation of a real number of roots, etc.) to solve, often can be difficult for the easy to simplify, received half