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因式分解复习

因式分解复习. 丁保华. 智力抢答. ( 1 ) 12.1×4+12.1 ×9 – 12.1 ×3. =12.1 × ( 4+9-3 ) =121. ( 2 ) 56 2 -44 2. = ( 56+44 )( 56-44 ) =1200. =56 2 +2 × 56 ×44+44 2 = ( 56+44 ) 2 =10000. ( 3 ) 56 2 +44 2 +56×88. 辨析选择. 1. 下列属于正确的因式分解是 ( ) ( A ) x 2 y+7xy+y=y ( x 2 +7x )

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因式分解复习

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  1. 因式分解复习 丁保华

  2. 智力抢答 (1)12.1×4+12.1 ×9 – 12.1 ×3 =12.1 ×(4+9-3)=121 (2)562-442 =(56+44)(56-44)=1200 =562+2 × 56 ×44+442 =(56+44)2=10000 (3)562+442+56×88

  3. 辨析选择 1. 下列属于正确的因式分解是 ( ) (A)x2y+7xy+y=y(x2+7x) (B)x2+8x-9=(x+3)(x-3)+8x (C)12a2b3-9ab2+18b2=3b2(4a2b-3a+6) (D)-2x2+4xy-6xz= -2x(x+2y-3z) C

  4. 2.下列多项式中,能用公式法进行 因式分解的是( ) D (A)-a2-b2 (B)x2+2x+4 (C)4y-x2 (D)m2-m+

  5. 小试身手 分解因式: (1)x3-25x (2)- 4y4+4y3-y2 (3)(ab+a)+(b+1) (4)m2(m+2n)-m-2n

  6. 实践应用 探究一 已知9x2+1+mx是关于x的完全平方式, 则m= 。 ±6

  7. 探究二 请静心阅读 解题过程,然后尝试解答。 因式分解:4x4+1 解:4x4+1 = 4x4+4x2+1-4x2 =(2x2+1)2-(2x)2 =( 2x2+1+ 2x)( 2x2+1-2x) 上述分解因式的方法我们称为添项法。请你尝试用添项法分解下列多项式: (1)x4+4 (2)x4+x2y2+y4

  8. 探究三 有甲,乙两块矩形场地,甲场地的长与宽分别为2(a+b)米和a米,乙场地的长与宽分别为4(a+b)米和b米,如果a>2b,请你比较这两块场地哪一块面积大?

  9. 知识梳理 1、因式分解的概念 2、因式分解的两种常用方法 (1)提取公因式法 (2)公式法 3、因式分解的应用

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