论文部分内容阅读
用运算符号把数或表示数的字母连结而成的式子叫做代数式.它是初一同学学习代数遇到的第一个重点,同时也是一个难点,是今后学习列方程解应用题的基础.学习这部分内容主要应学好以下几方面知识. 一、怎样列代数式 学习代数式首先要学会正确地列出代数式,要想正确地列出代数式,必须注意以下几点: 1.列代数式首先应理解和、差、积、商、倍和乘方的意义.例如:a,b两数的和,表示为a+b;x的平方与y的平方的差,表示为x2-y2. 2.代数式中一般都含有表示数的字母,用字母表示数有时有一定的范围,要注意这些字母虽然可以取
Using formulas to combine numbers or letters representing numbers is called algebraic type. It is the first key point that the first grader encounters in learning algebra, and it is also a difficult point. It is the basis for learning the application of column equations in the future. This part of the study should mainly learn the following aspects of knowledge. First, how to list algebraic algebraic algebra first learn to correctly list the algebraic formula, in order to correctly list the algebraic formula, must pay attention to the following points: 1. Column algebraic formula should be understood first and , difference, product, quotient, multiplier and power. For example: a, b The sum of two numbers, expressed as a+b; the difference between the square of x and the square of y, expressed as x2-y2. Usually contains a number of letters, the number of letters sometimes have a certain range, pay attention to these letters although you can take