解方程组是难度较大的计算工作。为了“消元”或“降次”,常采用代入法、加减法、分解因式等多种方法和一些特殊技巧。解题过程往往很长,容易出错。在教学中,如何认识各种方法的实质,把握住求解过程,指出学生错误所在,是教师经常面对的问题。本文叙述方程组的几个 Solving equations is a difficult calculation. In order to “eliminate the yuan” or “decrease the times,” often used substitution method, addition and subtraction, decomposition factor and other methods and some special skills. The problem-solving process is often long and error-prone. In teaching, how to understand the essence of various methods, grasp the solution process, and point out that students’ mistakes are frequently faced by teachers. This article describes several equations