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字母表示数是从算术过渡到代数的桥梁,代数的基本特征是引入了字母进行运算.因此,深刻理解用字母表示数的意义是学好代数的必要前提,在学习时必须注意以下几点. 一、要注意字母的任意性在一般情况下,每个字母都可以表示任意的数.例如:字母b既可以表示正数,也可以表示负数,当然也可以表示零.在式子中,它仅仅是一个表示数或式子的代号,在知道结果前它是一个未知的东西.
The letter representation number is a bridge from arithmetic to algebra. The basic feature of algebra is the introduction of letters to perform calculations. Therefore, a profound understanding of the significance of using letters to represent numbers is a necessary prerequisite for learning algebra. Attention must be paid to the following points when learning. , pay attention to the arbitrariness of letters In general, each letter can represent any number. For example: the letter b can either represent a positive number, it can also represent a negative number, of course, can also represent zero. In the formula, it only Is a code that represents a number or expression. It is an unknown thing before it knows the result.