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非常一:知识回顾 1．代数式:像a,a+b,2(m+n),s/t,4+3(x-1)这样的式子叫做代数式,单独的一个数也是代数式． 2．代数式的值:用数字代替代数式中的字母计算后所得的结果就是代数式的值．代数式的值是相对的,它随代数式中字母取值的变化而变化． 3．同类项与合并同类项:像8n与5n,2a2b和-7a2b这样所含字母相同,并且相同字母的指数也相同的项叫同类项．在合并同类项时,把同类
Very one: knowledge review 1. Algebraic expressions: Equations such as a, a+b, 2(m+n), s/t, and 4+3(x-1) are called algebraic expressions, and a single number is algebraic. 2. Algebraic values: Calculating the number of letters in the formula is a algebraic expression. Algebraic values are relative and change with the value of algebraic letters. 3. Similar items and merge similar items: Like 8n and 5n, 2a2b, and -7a2b contain the same letters, and the same letters of the same index is called the same type of item. When merging similar items, put the same class