七年级数学上册第六章整式的加减6.2同类项2课件(新版)青岛版.ppt

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6.2同类项(2),第六章 整式的加减,学校 ,同类项的定义:所含 ,并且 的也相同的项,叫做同类项。几个常数项也是_。,判断同类项:1、字母_;2、相同字母指数也分别_。与_无关,与 无关。,合并同类项的法则:_相加,作为结果的系数,字母和字母的指数_。,字母相同,相同字母,指数,同类项,相同,相同,系数,字母顺序,系数,不变,例2 先找出下列多项式中的同类项,然后合并同类项:,(1)4x28x53x26x2;,解:4x28x53x26x2,- ,= =, ,(4x23x2)(8x6x)(52), x22x3;,(2)xy2 3y3 3x2y2y3x2y xy2,解: xy2 3y3 3x2y2y3x2y xy2, ,= =, ,( xy2 xy2 )(3y3 2y3)(3x2y x2y ),y3 x2y, x2y y3,合并同类项的步骤:,1、找出同类项;,2、结合同类项;,3、合并同类项。,合并同类项,( 3 ) 6x10x2 5x ( 4 ) 2x22x32x3x2 ( 5 ) 0.3 xy2 3x2yx2y xy2 ( 6 ) 5y3 7 xy2 5y3 4x2y6 xy2 3x2y,

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