初中一年级数学下册第一章整式的乘除15平方差公式第一课时课件.ppt

Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,*,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,*,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,*,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,*,单项式,单项式,单项式,多项式,多项式,多项式,先回顾一下整式的乘,法,吧,计算：,(1),(2),(3),(4),解：,(1),(2),(3),(4),平方差公式,两数和与这两数差的积，等于它们的平方差。

例,】,计算：,（,1,）,（,2,）,1,3,5,2,4,你是怎么做的？,同号,数的平方减去,异号,数的平方,练习：计算,计算：,(1),(2),(3),(4),运用平方差公式进行整式的乘法时要注意：,1,、是两个,“,二项式,”,的乘积；,2,、这两个,“,二项式,”,的,“,一项,”,相同，且,“,另一项,”,相反；,3,、积为相同项的平方减去相反项的平方。