方程思想是重要的数学思想之一,与中学数学的各个分支紧紧地连在一起.在解题过程中,有许多看上去似乎与方程不发生明显联系的数学问题,如果能恰当地引进或构造方程,就能使问题迎刃而解.下面利用方程根的定义、根与系数的关系等方法构造方程解题. The idea of ​​equation is one of the important mathematical ideas, which are closely linked with all branches of high school mathematics.In the problem-solving process, there are many mathematical problems which do not seem to be obviously related to the equation. If we can properly introduce or Constructs the equation, will be able to solve the problem.The following uses the definition of the root of the equation, the relation between the root and the coefficient and so on method constructs the equation solution problem.