2017_2018学年八年级数学上册第十四章整式的乘法与因式分解微专题整式的乘法同步精练(新版)新人教版.docx

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1微专题 整式的乘法一、利用整式的乘法计算1(1)2 a(a2 1);【解题过程】解:2 a32 a(2)(x3)(2 x1);【解题过程】解:2 x25 x3(3)(2a3 b)(a2 b) a(2a b);【解题过程】解:6 b22 ab(4)5x(x22 x1)(2 x3)( x5)【解题过程】解:5 x38 x212 x15.二、利用整式的乘法解方程或不等式2(1)解方程 : x(3x4)2 x(x7)5 x(x7)90.【解题过程】解: x2.(2)解不等式:( x3)( x7)8( x5)( x1)【解题过程】解: x1.三、利用整式的乘法化简求值3. 若 x y1, xy2 ,求( x1)( y1)的值( 提示 :整体思想)(导学号:58024248)【解题过程】解:原式 xy x y10.4(2017合川)已知|2 a3 b7|( a9 b7) 20.求 的(14a2 12ab b2)(12a b)值(导学号:58024249)【解题过程】解: a2, b1,原式 a3 b32.18四、利用整式的乘法进行证明5求证:对于任意的正整数 n,代数式 n(n7)( n3)( n2)的值必是 6 的倍2数(导学号:58024250)【解题过程】证明:原式6( n1),必是 6 的倍数

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