（一）一元一次方程与一元二次方程一、知识要点1．方程的概念与分类（1）方程含有未知数的等式叫做方程．（2）方程的解能使方程左、右两边的值相等的未知数的值叫做方程的解；只含有一个未知数的整式方程的解又叫做方程的根．（3）解方程求方程的解或说明方程无解的过程叫做 (a) One-ary-one equation and one-member quadratic equation 1. Knowledge points 1. The concept of equations and classification (1) Equations Equations containing unknowns are called equations. (2) The solution of the equation can make the value of the unknown equal to the left and right of the equation equal to the solution of the equation; the solution of the integer equation containing only one unknown is also called the root of the equation. (3) Solving equations Solving equations or explaining the equations without solutions is called