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（一）整式的概念与运算一、知识要点1．单项式只含有数和字母的乘法运算的代数式叫做单项式．单项式中的数字因数叫做这个单项式的系数．所有字母的指数的和叫做这个单项式的次数．所含字母相同，并且相同字母的指数也分别相同的项叫做同类项．2．多项式几个单项式的和叫做多
(a) The concept and operation of the whole formula One, knowledge points 1. An algebraic expression in which a monomial contains only multiplications of numbers and letters is called a monomial. The digital factor in the monomial is called the coefficient of this monomial. The sum of the exponents of all letters is called the number of times this monomial. The same items that contain the same letter and the same letter index are called the same item. 2. The polynomials of several monomials are called multiple