一、代数初步知识 【知识要点】 1.用字母表示数:用字母表示数,能简明地表示出数量间的一般规律。常用字母表示的数量关系有运算定律、几何形体的计算公式、常见的等量关系。 2.方程:含有未知数的等式叫方程。求未知数的过程叫解方程。使得方程左右两边相等的未知数的值叫方程的解。 First, the initial knowledge of algebra [knowledge points] 1. The number of letters: the number of letters, can concisely show the general law of the number. Commonly used letters that the number of relations between the law of operation, the calculation of geometric forms, the common isometric relationship. Equation: Equations with unknowns are called equations. The process of finding unknowns is called solving equations. Equations that make the equal unknowns to the left and right of the equation are called solutions to the equation.