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整式这一章是有理数的延续,同时也是学好分式、函数的基础.学好整式要注意以下三点:一、注意理解整式中的相关概念知识点睛:1.单项式和多项式统称整式.2.同类项:所含字母相同并且相同字母的指数也相同的项。例1.代数式0,-a,2p~3,xyz~2,5~2,abc-8,5/x-1,盟中单项式的个数有( ).A.5 B.6 C.7 D.8点拨:①单独的一个数或一个字母是单项式.如:0,-a.②数与数的积,数与字母的积.字母与字母的积是单项式.如:2p~3,xyz~2,5~2.③几个单项式的代数和是多项式.如:abc-8.④分母中含有未知数的式子不是整式.如:5/x-1.
The whole chapter is a continuation of rational numbers, and it is also the basis for learning about fractions and functions. Learning the whole formula should pay attention to the following three points: First, pay attention to understanding the related concepts in the whole formula. Doctrine: 1. Monomials and polynomials are collectively called integers. Item: Items that have the same letter and the same letter. Example 1. Algebraic formulas 0, -a, 2p~3, xyz~2, 5~2, abc-8, 5/x-1, the number of monomials in the union is (). A.5 B.6 C.7 D.8 dialing: 1 A single number or letter is a monomial. For example: 0, -a.2 The product of a number and a number, the product of a number and a letter. The product of a letter and a letter is a monomial. For example: 2p~3, The algebraic sums of xyz~2,5~2.3 several monomials are polynomials. For example, the formulas with unknowns in the denominator of abc-8.4 are not integers. For example: 5/x-1.