2019届中考数学复习第一章数与式1.2整式及因式分解练习.doc

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1、第一章 数与式 1.2 整式及因式分解练习命题点 1 代数式及其运算(8 年 4 考)命题解读:题型均为选择题,分值为 3 分。主要考查整式的相关运算。1.(2012陕西中考)计算(-5 a3) 2的结果是( )A.-10a5 B.10a6 C.-25a5 D.25a62.(2018陕西中考)下列计算正确的是( )A.a2a2=2a4 B.(- a2) 3=-a6 C.3a2-6a2=3a2 D.( a-2) 2=a2-43.(2016陕西中考)下列计算正确的是( )Ax 2+3x2=4x4 Bx 2y2x3=2x4yC (6x 3y2)(3x)=2x 2 D (3x) 2=9x24.(201

2、5陕西中考)下列计算正确的是( )Aa 2a3=a6 B (2ab) 2=4a2b2C (a 2) 3=a5 D3a 3b2a2b2=3ab拓展变式1.(2018某交大附中模拟)下列计算正确的是( )A.5a22a=7a3 B.(-2 a2b) 2=4a2b2 C.2a2+a2=3a4 D.2a3ba2=2ab命题点 2 分解因式(8 年 4 考)命题解读 :题型为选择题或填 空题,分值为 3 分。主要考查利用提公因式法、公式法分解因式。5.(2018某师大附中模拟)下列分解因式正确的是( )A.x2-x=x( x2-1) B.a2+b2=( a+b) ( a-b) C.x2+1= D.-m2+n2=( m+n) ( n-m)1()6.(2012陕西中考)分解因式: 。33-xy7.(2011陕西中考)分解因式: ab2 4ab+4a= 。8.(2014陕西中考)分解因式: m(x-y)+n(x-y) = 。参考答案

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