整式运算练习题.doc1
整式运算练习
1.计算:a 4·a 4-a ·a 7+a 2·a 6+a 3·a 5
2.计算:x
m -3·x 2·x -x 3·x m -5·x 2-x 5·x m -9·x 4.
3.已知a
m +n =6,a n =2.求a 2m
+a 3n 的值. 4.求下列各式中的x :
(1)8x =4x +2; (2)x 4=16.
5.计算:(-2ab 4)·(-ac 2)·(3a 3b 2)
6.计算:(2xy 2)2·(-3x 2y )-(x 2)2y 5+2x 2·(x 3y 4)
7.解方程3x (x +2)+2x (x -1)=5x (1+x )+1
8.6ab 2(2-
31ab 4)+(-21ab 3)2 9.21x 2(4xy 2+6x 2y -x 2)·(-5x 3y 4)
10.-a 3[(3ab 2)3·
21b -(-3ab )2]-9a 5b 2
11.计算:7x 2-(2x -1)(x +5)-2(x +3)(x -4).
12.求乘积(3x 4-5x 3-x 2-1)(x 3-x 2-x +2)中含x 4项的系数
13.已知(x 2+mx -n )(x -3)的积为x 3-x 2-3x -9.求m 、n 的值.
14.计算
(1)(7a -
41bc )(41bc +7a ); (2)(21m 2-32n 3)(-32n 3-2
1m 2).
15.计算:
(1)104×996; (2)49
32×5031
16.计算:
(1)(-2a +b )(4a 2+b 2)(-2a -b );(2)161(2x -1)(2x +1)(4x 2+1)(x 4+161)
17.计算:
(1)(-2a -3b )2; (2)19982; (3)(a -2b +3c )2
18.计算:(1)(x 2+xy +y 2)(x 2-xy +y 2);(2)(a +b )2(a 2+b 2)2(a -b )2;
(3)97×103×9991.
19.已知(a +b )2=15,ab =2,求(1)a 2+b 2,(2)(a -b )2的值.
20.计算:
(1)(-2a +5b )2; (2)(-
21ab 2-32c )2;
(3)(x -3y -2)(x +3y -2); (4)(x -2y )(x 2-4y 2)(x +2y );
(5)(2a +3)2+(3a -2)2; (6)(a -2b +3c -1)(a +2b -3c -1)
(7)(s -2t )(-s -2t )-(s -2t )2; (8)(t -3)2(t +3)2(t 2+9)2.
21.求值:(1)已知a +b =7,ab =10,求a 2+b 2,(a -b )2的值.
(2)已知a -2b =5,ab =
2
3,求a 2+4b 2-11的值.
(3)已知(a +b )2=9,(a -b )2=5,求a 2+b 2,ab 的值.
22.解下列方程或不等式
(1)(2x -1)2-(3x +2)2=(1-x )(5x +4)+5.
(2)2(3x 2-2)-(2x +3)(2x +3)>(x -1)(2x +3).
23.计算:
(1)a 3n +2÷a 2n -1(n 为正整数); (2)(-ab )4÷(-ab )2;
24.计算:
(1)27m ÷9m ÷3m ; (2)(-a 2n )4·(-a )3÷[(-a 3)2n ·(-a )2
n +1].
25.计算2-5-(-3
2)-4+ 0+2-1·2-3
26.用科学记数法表示下列各数:
(1)4002010; (2)-35000; (3)0.00000816; (4)-0.0027.
27.已知x m =6,x n =9,求x 3
m -2n 的值
28.计算:
(1)64ab 2c 3÷(-5
4ac 2); (2)(-3x 2n +1y n )3÷[(-x 3y )2]n .
29.计算(4.5×10-8)÷(1.2×10-3)÷(-3×10-4).
30.计算:
(1)12(a -2b )5(x +y )n +4÷[-27(a -2b )5(x +y )3];
(2)3n 3·(-
21m 3)2÷6m 4n 2+m 4n 3÷(-72m 2n 2). 31.计算:
(1)(6a 5b 4-
109a 4b 3+53a 3b 3)÷53a 3b 3; (2)(2
1x 2n +1y n -3x 2n y 2n +8x n y 2n +1)÷(-4xy n -1). 32.化简[(x -2y )(3x +4y )+(-y +21x )(y +21x )+(2x -3y )2]÷(-4
1x ) 33.计算: [(-2xy )2·(31x 2)-(21xy 2)3·3x ]÷(-3
2x 3y 2).
34.化简:
(1)[(-3xy )2·x 3-2x 2·(3xy 2)3·21y ]÷9x 4y 2;
(2)[(4x -
21y )2+4y (x -16y )]÷8x 2.
35.计算:
(1)[(-a 3b
n -1)2·(a n +2b 2)3]4;(2)-x 2[(-2xy 2)3·23y -(-4xy )2]-16x 4y 2.
36.已知:a +b =-3,ab =-5求下列各代数式的值:
(1)(a +3)(b +3); (2)a 2+b 2;
(3)(a -b )2; (4)a 2-ab +b 2.
37.已知a 2+a -4=0,求2a 3+10a 2-30的值.
38.已知(x -2)(x 2+px +q )=x 3-5x 2-13x -2,求p ,q 的值.
39.解下列方程或不等式
(1)2(2y +1)2-8(y +1)(y -1)=34.
(2)(x -2)(x 2+2x +4)-x (x -2)2<4x (x +1).
40.(1)如果a +4b +3=0,求2a ·16b 的值;(2)如果2a =3,2b =5,求42a -b 的值.
41.已知a +b +c =8,a 2+b 2+c 2=30,求ab +bc +ac 的值.
42.已知a 2+6a +b 2-10b +34=0,求代数式(2a +b )(3a -2b )+4ab 的值.
43.解方程组与不等式
(1)??
?+=-+=+-++.3)3)(4(0)2()5)(1(xy y x y x y x
(2)(x +1)(x 2-x +1)-x (x -1)2<(2x -1)(x -3).