第八章-整式的乘法单元测试题2页.doc

第八章 整式的乘法单元测试题一、选择题。（每小题3分，共54分）1.下列计算正确的是( ) A.2a22a2=4a2 B.2x22x3=2x5 C.xy=(xy)4 D.(-3x)2=9x22.若,则等于( )A.8 B.15 C.45 D.753.(-x2y3)3(-x2y2)的结果是( )A.-x7y13 B.x3y3 C.-x8y13 D.-x7y54.(x+4y)(x-5y)的结果是( )A.x2-9xy-20y2 B.x2+xy-20y2 C.x2-xy-20y2 D.x2-20y25.如果(ax-b)(x+2)=x2-4,那么( )A.a=1,b=-2 B.a=-1,b=-2; C.a=1,b=2 D.a=-1,b=26.化简代数式(x-3)(x-4)-(x-1)(x-3)的结果是( )A.-11x+15 B.-11x-15; C.-3x-9 D.-