七年级数学上册第六章整式的加减6.1《单项式与多项式》课件(新版)青岛版.ppt

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1、6.1 单项式与多项式,第六章 整式的加减,学习目标,1.掌握整式、单项式、多项式的概念.2.会区分单项式、多项式.3.会找单项式的系数与次数,多项式的次数与项.,观察下列代数式,它们含有哪些运算?,(2)0.5b-a,特别地,单独的一个字母或一个数也是单项式.,只含有加、减、乘、乘方运算的代数式叫做整式.,其中,不含有加、减运算的整式叫单项式。,(5)2a,(6)xy,(3)2xy+y,(1)a+b,(4)a2,思考与探究:,注意:除式(或分母)中含有字母的代数式不是整式。,观察下列代数式,哪些是单项式?,看谁反应快,y,60,2a+3b,0.5x-y,注意 单项式系数包括它前面的符号;,单

2、项式系数是1或1时,1可省略不写,但“1”时,“”号不可省略。,观察下列单项式的结构,它们由哪两部分组成?,2a 4a2 5xy -3b,单项式中的数字因数叫单项式的系数。,单项式中所有字母指数的和叫做单项式的次数。,思考与探究:,指出下列各单项式的系数和次数:,2,3,-5,2,4,1,1,1,-5,0,看谁反应快,2,-1,几个单项式的和叫多项式.,多项式中的每个单项式叫多项式的项.,多项式中不含字母的项叫常数项.,多项式中次数最高项的次数叫多项式的次数.,观察下列整式,与单项式有什么联系?,2x4+y2+5,a2-b-1,x+1,思考与探究:,指出下列多项式的各项,是几次几项式:,一次三项式,四次四项式,二次三项式,看谁反应快,4m,-3n,-1,2,2a,2xy,2x3y,x5,y,五次二项式,a2,2ab,b2,课 堂 小 结,只含有加、减、乘、乘方运算的代数式叫做整式.,不含有加、减运算的整式叫单项式。,单项式中的数字因数叫单项式的系数。,单项式中所有字母指数的和叫做单项式的次数。,几个单项式的和叫多项式.,多项式中的每个单项式叫多项式的项.,多项式中不含字母的项叫常数项.,多项式中次数最高项的次数叫多项式的次数.,

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