1、一、选择题 1.(2a3b2-10a4c ) 2a3等于( )Aa6b2c Ba5b2c Cb2-5ac Db4c -a4c2. ( x4y3+x3yz ) x3y等于( )Ax4y3+xz By3+x3y Cx14y4 Dxy2+z 3.(x17y+x14z)(x7)2 等于( )Ax3y+z Bxy3+z Cx17y+z Dxy+z 4.(612b2-612ac )(6)34等于( )Ab2-b2c Ba5-b2c Cb2-ac Db4c -a4c5.(8x6y+8x3z)(2x)3等于( )Ax6y+x14z Bx6y+x3yz Cx3y+z Dx6y+x3yz 6. (4x2y4+4x
2、2z ) (2x)2等于( )A4y4+z By4+z Cy4+x2z Dy4+z 7. (x7y4+x7z )x7等于( )Ay4+z B4x2y4+xz Cx2y4+x2z Dx2y4+z 8.( x3y2+x2z) x2等于( )Axy+xz Bx2y4+x2z Cxy2+z Dxy4+x2z 9.( -5a4c -5ab2c) (-5ac)等于( )A-a6b2-c Ba5-b2c Ca3b2-a4c Da3+b210.( x2y2+y7+y5z)y2等于( )Ax2+ y5+y3z Bx2y2+y5z Cx2y +y5z Dx2y2+y7+y5z 11.(2a4+2b5a2)a2等于
3、( )Aa2c+b5c B2a2+2b5 Ca4+b5 D2a4+ba2 二、填空题12(5x3y2+5x2z)5x2等于 ;13(2a3b2+8a2c)2a2等于 ;14(6a3b2+14a2c)a2等于 ;15(-6a3-6a2c )(-2a2)等于 ;16(-12x3-4x2)(-4x2)等于 ;三、计算题17(2a4 -6a2+4a) 2a18(3a3b2+3 a2b3- 3 a2b2)3ab19.( x2 y3-9x y5 +8y2)y2答案:1.C 2.D 3.A 4.C 5.C 6.D 7.A 8.C 9.D 10.A 11.B12xy2+z 13ab2+4c 146ab2+14c 153a+3c 163x+117解:(2a4 -6a2+4a) 2a=2a4 2a - 6a2 2a +4a 2a = a3 -3a+218解:(3a3b2+3 a2b3- 3 a2b2)3ab=3a3b23ab +3 a2b33ab - 3 a2b23ab =a2b+ ab2- ab 19.解:( x2y3-9x y5 +8y2)y2= x2y3y2-9x y5y2 +8y2y2= x2y3-2-9x y5-2 +8y2-2= x2y-9x y3+8