2019年中考数学专题复习小训练专题2整式、因式分解.doc

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1专题 2 整式、因式分解 12018益阳下列运算正确的是( )A x3x3 x9 B x8x4 x2C( ab3)2 ab6 D(2 x)38 x322017泰安下列运算正确的是( )A a2a22 a2B a2 a2 a4C(12 a)212 a4 a2D( a1)( a1)1 a232017淄博若 a b3, a2 b27,则 ab等于( )A2 B1 C2 D142018攀枝花分解因式: x3y2 x2y xy_52017泰州已知 2m3 n4,则代数式 m(n4) n(m6)的值为_62017达州分解因式:2 a38 ab2_72017安顺已知 x y , xy ,则 x2y xy2的值为_3 682017安顺若代数式 x2 kx25 是一个完全平方式,则 k_92018江西计算:( a1)( a1)( a2) 2.102017荆门先化简,再求值:(2x1) 22( x1)( x3)2,其中 x .22详解详析1 D 2. D 3. B 4.xy(x1) 258 62a(a2b)(a2b) 7.3 8.1029解:原式a 21(a 24a4)a 21a 24a44a5.10解:原式4x 24x12(x 22x3)24x 24x12x 24x622x 25.当 x 时,原式2( )252259.2 2

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