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整式的乘法与因式分解测试题一选择题(20分)1下列多项式中可以提取公因式的是( )A B C D2化简的结果是( )A B C D3下列两个多项式相乘不能用平方差公式的是( )A BC D4下列运算正确的是( )A BC D5下列多项式中没有公因式的是( )A和(xy) B和C和 D和6若是完全平方式则=( )A12 B24 C±12 D±247下
整式的乘法与因式分解填空若xy8x2y24则x2y2_________.2.代数式4x23mx9是完全平方式则m___________. 3.(-a1)(a1)(a21)= 4.一个正方形的边长增加4cm 面积就增加56cm 原来正方形的边长为 5. ()( ) 6. 则 7. 则
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