整式的加减是用字母表示数后的第一次应用 ,学习时需要注意下面四个方面的问题 .须知一　注意理解“式”本章涉及单项式、多项式、整式等几个概念 ,要注意准确理解这些概念 ;几个单项式的代数和组成多项式 ,单项式与多项式统称为整式 .例 1下列命题 :① 2x2 yπ 是单项式 ;② x The addition and subtraction of the whole formula is the first application after the number is expressed by letters. When learning, it is necessary to pay attention to the following four aspects. Notice to understand the “form” This chapter deals with concepts such as monomial, polynomial, and integral, and it requires careful understanding. These concepts; several monomials of algebra and compositional polynomials, monomials and polynomials are collectively referred to as integrals. Example 1 The following propositions: 1 2x2 yπ is a monomial; 2 x