摘要：选择题 (1)(x2)3·(x3-3x2+4x-1)＝( ). A. x18-3x12+4x6-1 B. x9-3x8+4x7-x6 C. x8-3x7+4x6-x5 D. x9-3x8+4x7 (2)下列计算正确的是( ). A.(6xy2-4x2y)·3xy＝18xy2-12x2y B.(-x)(2x+x2-1)＝-x3-2x2+1 C.(-3x2y)＝6x3y2-9x2y2z2-3x2y D.(an+1-b)·2ab＝an+2b-ab2 ＝bx-by,②b(xy)＝bxby,③bx+y＝bx+by,④2164＝(64)3,⑤x2n-1y2n-1＝xy2n-2正确的是( ) A.①② B.①③ C.①④ D.①④⑤ (4)一个长方体的长.宽.高分别是3x-4.2x和x.则它的体积等于( ) A. ·2x·x＝3x3-4x2 B. x·2x＝x2 C.·2x·x＝6x3-8x2 D.2x＝6x2-8x

网址：http://m.1010jiajiao.com/timu3_id_773458[举报]