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1、多项式乘以多项式练习试题1/3 多项式与多项式相乘一、选择题1.计算(2 a3b)(2 a3b)的正确结果是()A4a29b2 B4a29b2 C4a212ab9b2 D4a212ab9b22.计算(a-b)(a-b)其结果为()Aa2-b2 Ba2+b2 Ca2-2ab+b2 Da2-2ab-b23.下面计算中,正确的是()A(m-1)(m-2)=m2-3m-2 B(1-2a)(2+a)=2a2-3a+2 C(x+y)(x-y)=x2-y2 D(x+y)(x+y)=x2+y2 4.若 0 x1,那么代数式(1x)(2 x)的值是()A一定为正B一定为负C一定为非负数D不能确定5.(x+a)(
2、x-3)的积的一次项系数为零,则a 的值是()A1 B2 C3 D4 二、填空题1.(3x1)(4x5)_2.(4xy)(5x2y)_3.若 a2a12,则(5a)(6a)_三、计算题(1)(x8y)(x y)(2)(x1)(2x3)(3)(m 2n)(3 m n)(4)(x2)(x2)(5)(xy)(x2xyy2)(6)n(n1)(n2)(7)()()mnmn(8)22)2(xyx(9)(32)(32)aa(10)(a+b+2)(a+b-2)(11)168()4(2xx (12)22(1)(1)mnmn(13)xy(x1)(x+1)(14)2(2)4()(2)xyxyxy多项式乘以多项式练习
3、试题2/3(15)5(x 1)(x+3)2(x 5)(x 2)(16)2)23()3)(12(xxx(17)(a+b+2)(a+b-2)(18)22(1)(1)mnmn(19)2x(2x3)(2x+3)(20)2(2)4(2)(2)xyxyxy(21)2(23)(25)(25)xxx(22)2)23()3)(12(xxx四.解方程:(2x+3)(x-4)-(x+2)(x-3)=x2+6五.先化简,再求值:5x(x2+2x+1)-x(x-4)(5x-3),其中 x=1文档编码:CY3S3P6O5B2 HE2Y6B7G7E9 ZJ6R2M10Y2Z7文档编码:CY3S3P6O5B2 HE2Y6B7
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