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列方程解应用题体现了一种重要的数学思想和方法,是历年来中考的必考内容·因此,同学们一定要学好它,熟练掌握它的解题步骤,也就是:1、认真审题,理解题意·主要是弄清题目中的数量关系,已知数和未知数(包含题目中的要求求出的未知数);2、设元·用1个(或2个)字母表示某个(或2,3个)未知数,并用元的代数式表示其余的未知数·3、寻找等量关系,列出方程或方程组·4、解方程或方程组,求出未知数的值·间接设元
The application of the equations in the equation equations represents an important mathematical idea and method. It is a must-read content for the annual examination in the past years. Therefore, the students must learn it well and master its problem-solving steps. That is: 1. Carefully examine questions. Understanding the meaning of the questions is mainly to find out the quantitative relationships among the questions, the known and unknown numbers (including the unknowns required to be found in the questions), and 2 to designate one (or two) letters to represent one (or 2,3) unknowns, and use the algebraic expression of the elements to represent the rest of the unknowns, 3, find the isometric relationship, list the equations or equations 4, solve the equations or equations, find the value of the unknowns, indirectly set the yuan