八年级数学上册 小专题(十)整式的乘除运算练习 (新版)新人教版
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小专题(十) 整式的乘除运算
1.计算:
(1)(a 3)3·(a 4)3;
(2)(213)20×(37)21;
(3)(-a 2)3·(b 3)2·(ab)4;
(4)(x 4)2+(x 2)4-x(x 2)2·x 3-(-x)3·(-x 2)2·(-x).
2.计算:
(1)3xy 2·(-2xy);
(2)(-3a 3)2·(-2a 2)3;
(3)(-3x 2y)2·(-23xyz )·34xz 2;
3.计算:
(1)(-2a 2)·(3ab 2-5ab 3)+8a 3b 2;
(2)(3x -1)(2x +1);
(3)(2x +5y)(3x -2y)-2x(x -3y);
(4)(x -1)(x 2+x +1).
4.计算:
(1)21x 2y 4÷3x 2y 3;
(2)(8x 3y 3z )÷(-2xy 2);
(3)a 2n +2b 3c ÷2a n b 2;
(4)-9x 6÷13x 2÷(-x 2).
5.计算:
(1)(-2a 2b 3)·(-ab)2÷4a 3b 5;
(2)(-5a 2b 4c 2)2÷(-ab 2c)3.
6.计算:
(1)[x(x 2y 2-xy)-y(x 2-x 3y )]÷x 2y ;
(2)(23a 4b 7-19a 2b 6)÷(-16ab 3)2.
7.计算:
(1)(-76a 3b )·65abc ;
(2)(-x)5÷(-x)-2÷(-x)3;
(3)6mn 2·(2-
13mn 4)+(-12
mn 3)2;
(4)5x(x 2+2x +1)-(2x +3)(x -5).
8.先化简,再求值:
(1)(-12ab 2)·(14a 2b 4)-(-a 3b 2)·(-b 2)2,其中a =-14
,b =4;
(2)(a +b)(a -2b)-(a +2b)(a -b),其中a =-2,b =23
;
(3)(-13xy)2[xy(2x -y)-2x(xy -y 2)],其中x =-32
,y =-2;
(4)(2a +3b)(3a -2b)-5a(b +1)-6a 2,其中a =-12
,b =2.
参考答案
1.(1)原式=a 21. (2)原式=37
. (3)原式=-a 10b 10. (4)原式=0. 2.(1)原式=-6x 2y 3. (2)原式=-72a 12. (3)原式=-92
x 6y 3z 3. (4)原式=-12x 7y 9. 3.(1)原式=2a 3b 2+10a 3b 3. (2)原式=6x 2+x -1. (3)原式=4x 2+17xy -10y 2. (4)原式=x 3-1. 4.(1)原式=7y. (2)原式=-4x 2yz. (3)原式=12
a n +2bc. (4)原式=27x 2. 5.(1)原式=-12
a. (2)原式=-25ab 2c. 6.(1)原式=2xy -2. (2)原式=24a 2b -4. 7.(1)原式=-75a 4b 2c. (2)原式=x 4. (3)原式=12mn 2-74m 2n 6. (4)原式=5x 3+8x 2+12x +15. 8.(1)原式=78a 3b 6.当a =-14
,b =4时,原式=78×(-14)3×46=-56. (2)原式=-2ab.当a =-2,b =23时,原式=(-2)×(-2)×23=83. (3)原式=19x 3y 4.当x =-32,y =-2时,原式=19×(-32)3×(-2)4=-6. (4)原式=-6b 2-5a ,当a =-12
,b =2时,原式=-6×22-5×(-12)=-24+52=-2112
.