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1、单项式与单项式相乘1.-5a2b-3a等于A15a3b B-15a2b C-15a3b D-8a2b2.2a3-5b2等于A10a3b B-40a3b2 C-40a3b D-40a2b3.2a3b2-5ab2c等于A-20a6b4c B10a7b4c C-20a7b4c D20a7b4c4.2x3y25xy2x7 等于A-20x6y4 B10xyy4 C-20x7y4 D20x14y45以下计算正确的选项是 ( )A9a32 a218 a5 B2 x53 x45 x9C3 x34 x312 x3 D3 y35 y315 y96以下计算错误的选项是 ( )A(-2.4 x2 y3)(0.5 x4
2、)-1.2 x6 y3 B(-8 a3bc)= a4 b2cxC(-2 an)2(3 a2)3-54 a2n+6 Dx2n+2(-3 xn+2)=-3x3n+47(-x5)2(-x5x2)2 8(xn)2+5 xn-2xn+29= .10(4103) 3(-0. 125102) 211(0.1ab3)(0.3a3bc)12a3 x3(-2 ax2)13xy=-xy2z.14计算(1)(-3 an+2b)3(-4abn+3)2；2(-7 a2 xn)(-3 ax2)(- am xn)(m0，n0)；3(-10x2y)2xy4z4(-2 x y2)-3 x2y4(- x y)答案：1.A2.B3.C4.D5A 6C7x2486x2n94 x14101013110.03 a4 b4 c12-2 a3 x513- yz14解：(1)-432 a3n+8 b2n+9 (2)-2l am+3 x2n+23-20 x3 y5 z4(-2 x y2)-3 x2y4(- x y)= -6 x1+2+1y2+4+1=-6 x4 y7