单项式的乘法习题

1、?单项式的乘法?习题、选择题1. 计算x2 .y2(-xy3)2的结果是().八 5104858612A. x y B. x y C. -x y D. x y2. (-1x2y)3 +(1x2y)2,(x2y)计算结果为().243636 356 3A. -而x y b.0 C. -x y D.一五x y3. (2.5 x103)3 x(-0.8x102)2 计算结果是().13131314A. 6 10 B. -6 10 C. 2 10 D. 1012 23 3 .4 .计算 2xy x2y2z)3x3y3)的结果是().2A. 3x6y6zB. -3x6y6z C. 3x5y5zD. -3

2、x5y5z5 .计算(a2b)3 +2a2b ,(3a2b)2的结果为().A. -17a6b3B. -18a6b3C. 17a6b3D. 18a6b36 .x的m次方的5倍与x2的7倍的积为().A. 12x2m B. 35x2m C. 35xm 2 D. 12xm 27 . (-2x3y4)3 (-x2yc)2等于().A. -8x13y14c2B. 8x13y14c2 C. -8x36y24c2D.8x36y24c28 . x3ym,xm4n,y2nH2 =x9y9,贝U 4m -3n =().A. 8 B. 9C.10 D.无法确定o 2 -9 .计算(3x2) ,(一r3m '

3、;yn)(ym)的结果是().34m mn11 2m 2 m3m“2mx115mmA. 3x y B. 一-x y C. -2xy D. 一-(x y)3310 .以下计算错误的选项是().23/3、2122、2/2134. 7A. (a ) (-a ) =aB. (-ab ) (-a b ) = a bnn 22n 1 n -22223 3 3C. (2xy ) (3x y) =18x y D. (-xy )(-yz )(-zx ) = x y z11 .化简 x(2x-1)-x2(2 -x)的结果是().A. -x3 -x B. x3 -x C. -x2 1 D . x3 -112 .化简

4、 a(b c) b(c a)+c(a b)的结果是().A. 2ab+2bc+2ac B. 2ab - 2bcC. 2abD -2bc13.如图142是L形钢条截面,它的面积为().T c I*-心卜b I图 14一2A . ac+bc B, ac+(b-c)cC. (a-c)c+(b-c)c D. a+b+2c+(a-c)+(b-c)14 .以下各式中计算错误的选项是()A.2x -(2x1198. (1.2父10 )(2.5父10 )(4父10) =.9. (-3x2)(-x2+2x-1)=. 3x -1) =4xz_3,12 x6x2-2x B . b(b2 -b 1) =b3 -b2

5、b1 2323 3422C x(2x -2) - -x - xD. x( x - 3x 1) = x - 2x- x2 3 23,1. 212115 . (-ab -a b6ab) (6ab)的结果为().232 23 22 2A . 36a b B. 5a b 36a b _ 2. 33. 22. 22. 32. 2C. -3a b 2a b 36a b D. -a b 36a b二、填空题 221. (ax )(a x) =.2 25 32. ()(x y) = -x y3. (-3x3y) (-x4) (-y3) =.4. 一6a2b 1(abc)2 = 25. (-3a2b3)2 4(

6、-a3b2)10. -(2x -4x -8) (一-x )=2 =.6. 15xny 2xn,yn4 =.1、37 2m (-2mn) ,(mn)=211. 2(a2b2 -ab 1) 3ab(1 -ab) = .223212. (3x2)(x2 -2x 3) +3x(x2 325 413(5 ) ( -a) ( -2ab ).4ab (7a b ab -5)23. ab2 =6 ,求 ab(a2b5 -ab3 -b)的值. 124.右 x = , y=1,求 x(x -2x2 -5) = 22 ,13. 8m(m 3m +4) m (m 3) =.14. 7x(2x -1) -3x(4x -

7、1)-2x(x+3) +1 =.15. (2a2b)2(ab2 a2b + a3) =.22 、32/6316. _(x) (2x y) +2x (x y _1) =.17. 当 t=1 时,代数式 t3 -2t2t2 3t(2t +2)的值为.18. 假设 2x + y = 0 ,那么代数式 4x3 +2xy(x + y) + y3 的值为三、解做题1 .计算以下各题(1)4xy2 (-3x2yz3)8(2)(3a3b2)( -21a3b3c)73(3)3.2mn2(-0.125m2n3)1(5 ) 5x (§ax) (-2.25axy) (1.2x2y2)1、2 2 2 / 33

8、、(4) (- n xyz) x y (- yz )235(6) -x2y (-0.5xy)2 -(-2x)3 xy352 .计算以下各题./111(1) a (a b) (a -b) (a - 2b)3 26_13 22212 2(2 x y (-2xy ) (-2x y) ( xy) 3x y z4 2(3 )212213(3x-y -y ) (-xy)232,八32(4 )12ab2a-(a-b)-b+ xy + y2) - y(x2 + xy + y2) + 3xy(y - x)的值.43四、探究创新乐园1 .先化简,再求值2 21x(x2 -6x -9) -x(x2 -8x-15)+2x(3-x),其中 x = _ .62, 2m5+(2m5n+20)2 =0.求(2m2) -2m(5n -2m) +3n(6m 5n) 3n(4m 5n)的值.2_3 .解万程：x(2x-5