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整式的乘法练习题

2024-03-04 来源:步旅网
整式的乘法练习题

(一)填空

1.a8=(-a5)______. 2.a15=( )5. 3.3m2·2m3=______. 4.(x+a)(x+a)=______.

5.a3·(-a)5·(-3a)2·(-7ab3)=______. 6.(-a2b)3·(-ab

2

)=______. 7.(2x)2·x4=( )2.

8.24a2b3=6a2·______. 9.[(am)n]p=______. 10.(-mn)2(-m2n)3=______.

11.多项式的积(3x4-2x3+x2-8x+7)(2x3+5x2+6x-3)中x3项的系数是______.

12.m是x的六次多项式,n是x的四次多项式,则2m-n是x的______次多项式.

14.(3x2)3-7x3[x3-x(4x2+1)]=______.

15.{[(-1)4]m}n=______. 16.-{-[-(-a2)3]4}2=______.

17.一长方体的高是(a+2)厘米,底面积是(a2+a-6)厘米2,则

它的体积是______.

18.若10m=a,10n=b,那么10m+n=______. 19.3(a-b)2[9(a-b)n+2](b-a)5=______(a-b)n+9.

20.已知3x·(xn+5)=3xn+1-8,那么x=______. 21.若a2n-1·a2n+1=a12,则n=______.

22.(8a3)m÷[(4a2)n·2a]=______. 23.若a<0,n为奇数,则(an)5______0.

24.(x-x2-1)(x2-x+1)n(x-x2-1)2n=______.

25.(4+2x-3y2)·(5x+y2-4xy)·(xy-3x2+2y4)的最高次项是______.

26.已知有理数x,y,z满足|x-z-2|+(3x-6y-7)2+|3y+3z-4|=0, 则x3n+1y3n+1z4n-1的值(n为自然数)等于______.

(二)选择

27.下列计算最后一步的依据是[ ]

5a2x4·(-4a3x)

=[5

×

(-4)]·a2·a3·x4·x (乘法交换律)

=-20(a2a3)·(x4x) (乘法结合律)

=-20a5x5. ( )

A.乘法意义;B.乘方定义;C.同底数幂相乘法则;D.幂的乘方法则.

28.下列计算正确的是[ ]

A.9a3·2a2=18a5;B.2x5·3x4=5x9;C.3x3·4x3=12x3;D.3y3·5y3=15y9. 29.(ym)3·yn的运算结果是[ ]

B.y3m+n;C.y3(m+n);D.y3mn.

30.下列计算错误的是[ ]

A.(x+1)(x+4)=x2+5x+4; B.(m-2)(m+3)=m2+m-6;

C.(y+4)(y-5)=y2+9y-20; D.(x-3)(x-6)=x2-9x+18. 31.计算-a2b2·(-ab3)2所得的结果是 [ ] A.a4b8;B.-a4b8;C.a4b7;D.-a3b8. 32.下列计算中错误的是[ ]

A.[(a+b)2]3=(a+b)6;B.[(x+y)2n]5=(x+y)2n+5; C.[(x+y)m]n=(x+y)mn;D.[(x+y)m+1]n=(x+y)mn+n.

33.(-2x3y4)3的值是[ ] A.-6x6y7;B.-8x27y64;C.-8x9y12;D.-6xy10.

34.下列计算正确的是[ ]

A.(a3)n+1=a3n+1;B.(-a2)3a6=a12;C.a8m·a8m=2a16m;D.(-m)(-m)4=-m5.35.(a-b)2n·(b-a)·(a-b)m-1的结果是 [ ]

A.(a-b)2n+m;B.-(a-b)2n+m;C.(b-a)2n+m;D.以上都不对. 36.若0<y<1,那么代数式y(1-y)(1+y)的值一定是 [ ]

A.正的;B.非负;C.负的;D.正、负不能唯一确定. 37.(-2.5m3)2·(-4m)3的计算结果是 [ ] A.40m9;

B.-40m9;C.400m9;D.-400m9.

38.如果b2m<bm(m为自然数),那么b的值是[ ]

A.b>0;B.b<0;C.0<b<1;D.b≠1. 40.下列运算中错误的是[ ]

A.-(-3anb)4=-81a4nb4; B.(an+1bn)4=a4n+4b4n;C

(-2an)2

·

(3a2)3=-54a2n+6

;D.(3xn+1-2xn)·5x=15xn+2-10xn+1.

41.下列计算中,[ ]

(1)b(x-y)=bx-by, (2)b(xy)=bxby, (3)bx-y=bx-by,(4)2164

=(64

)3

, (5)x2n-1

y2n-1

=xy2n-2

. A.只有(1)与(2)正确;

B.只有(1)与(3)正确;C.只有(1)与(4)正确;D.只有(2)与(3)正确.

42.(-6xny)2·3xn-1y的计算结果是 [ ]

A.18x3n-1y2;B.-36x2n-1y3;C.-108x3n-1y;D.108x3n-1y3.

[ ]

44.下列计算正确的是[ ]

A

(6xy2-4x2y)

·

3xy=18xy2-12x2y

;B.(-x)(2x+x2-1)=-x3-2x2+1;

C

.(-3x2y)(-2xy+3yz-1)=6x3y2-9x2y2z2-3x2y;

45.下列计算正确的是[ ]

A.(a+b)2=a2+b2; B.am·an=amn; C.(-a2)3=(-a3)2;D.(a-b)3(b-a)2=(a-b)5.

[

]

47.把下列各题的计算结果写成10的幂的形式,正确的是[ ]

A.100×103=106; B.1000×10100=103000; C.1002n×1000=104n+3; D.1005×10=10005=1015. 48.t2-(t+1)(t-5)的计算结果正确的是 [ ] A.-4t-5 ; B.4t+5; C.t2-4t+5; D.t2+4t-5. 49.使(x2+px+8)(x2-3x+q)的积中不含x2和x3的p,q的值分别是[ ]

A.p=0,q=0;B.p=-3,q=-9;C.p=3,q=1;D.p=-3,q=1.50.设xy<0,要使xnym·xnym>0,那么[ ] A.m,n都应是偶数;B.m,n都应是奇数;

C.不论m,n为奇数或偶数都可以;D.不论m,n为奇数或偶数都不行.

51.若n为正整数,且x2n=7,则(3x3n)2-4(x2)2n的值为[ ]A.833;B.2891;C.3283;D.1225.

(三)计算 52

(6

×

108)(7

×

109)(4

×

104). 53.(-5xn+1y)·(-2x).

54.(-3ab)·(-a2c)·6ab2. 55.(-4a)·(2a

2

+3a-1).

56.(3m-n)(m-2n). 57.(x+2y)(5a+3b).

58.(-ab)3·(-a2b)·(-a2b4c)2. 59.[(-a)2m]3·a3m+[(-a)5m]2.

60.xn+1(xn-xn-1+x). 61.(x+y)(x2-xy+y2).

62.5x(x2

+2x+1)-(2x+3)(x-5). 63.(2x-3)(x+4).

64

(-2ab2)

3

·

(3a2

b-2ab-4b2

)

65.-8(a-b)3·3(b-a)

66.2[(x+2)(x+1)-3]+(x-1)(x-2)-3x(x+3). 67.(-4xy3

)·(-xy)+(-3xy2

)2

68.计算[(-a)2m

]3

·a3m

+[(-a)3m

]3

(m为自然数).

69.先化简(x-2)(x-3)+2(x+6)(x-5)-3(x2-7x+13),再求其值,其中x=

70.已知ab2=-6,求-ab(a2b5-ab3-b)的值

《乘法公式》练习题(一)

一、填空题

1.(a+b)(a-b)=_____,公式的条件是_____,结论是_____. 2.(x-1)(x+1)=_____,(2a+b)(2a-b)=_____,(

13x-

y)(13x+y)=_____.

3.(x+4)(-x+4)=_____,(x+3y)(_____)=9y2-x2,(-m-

n)(_____)=m2-n2

×102=(_____)(_____)=( )2-( )2=_____. 5.-(2x2+3y)(3y-2x2)=_____. 6.(a-b)(a+b)(a2+b2)=_____.

7.(_____-4b)(_____+4b)=9a2-16b2,(_____-2x)(_____-2x)=4x2-25y2

8.(xy-z)(z+xy)=_____,(5x-(566x+=_____. 9.(1x+y2)(_____)=y4-1416x2

10.观察下列各式: (x-1)(x+1)=x2-1 (x-1)(x2+x+1)=x3-1 (x-1)(x3+x2+x+1)=x4-1 根据前面各式的规律可得 (x-1)(xn+xn-1+…+x+1)=_____. 二、选择题

11.下列多项式乘法,能用平方差公式进行计算的是( )

A.(x+y)(-x-y) B.(2x+3y)(2x-3z) C.(-a-b)(a-b) D.(m-n)(n-m) 12.下列计算正确的是( )

A.(2x+3)(2x-3)=2x2-9 B.(x+4)(x-4)=x2-4 C.(5+x)(x-6)=x2-30 D.(-1+4b)(-1-4b)=1-16b2

13.下列多项式乘法,不能用平方差公式计算的是( ) A.(-a-b)(-b+a) B.(xy+z)(xy-z) C.(-2a-b)(2a+b) D.-y)(-y- 14.(4x2-5y)需乘以下列哪个式子,才能使用平方差公式进行计算( )

A.-4x2-5y B.-4x2+5y C.(4x2-5y)2

D.(4x+5y)2

+(1-a)(1+a)(1+a2)的计算结果是( ) A.-1 C.2a4-1 -2a4 16.下列各式运算结果是x2-25y2的是( )

A.(x+5y)(-x+5y) B.(-x-5y)(-x+5y) C.(x-y)(x+25y) D.(x-5y)(5y-x)

三、解答题

17.1.03× 18.(-2x2+5)(-2x2-5) (a-5)-(a+6)(a-6) 20.(2x-

3y)(3y+2x)

-(4y-3x)(3x+4y)

21.(1x+y)(1x-y)(1339x2+y2)

22.(x+y)(x-y)-x(x+y) (2x+1)(2x-1)-2(3x+2)(2-3x) -4 ×2001-20022

《乘法公式》练习题(二)

1.(ab)2a2b2--( ) 2.(xy)2x22xyy2---( ) 3.(ab)2a22abb2--( ) 4.(2x3y)22x212xy9y2( )

5.(2x3y)(2x3y)4x29y2( ) 6

(2x3y)(3xy)______________; 7.(2x5y)2_______________;

8.(2x3y)(3x2y)______________; 9.

(4x6y)(2x3y)______________;

10(12x2y)2________________ 11.(x3)(x3)(x29)____________;

12.(2x1)(2x1)1___________;

13。(x2)(________)x24; 14.(x1)(x2)(x3)(x3)_____________; 15

(2x1)2(x2)2____________;

16.(2x______)(______y)4x2y2; 17.(1x)(1x)(1x2)(1x4)______________;

18.下列多项式乘法中不能用平方差公式计算的是( )

(A) (a3b3)(a3b3) (B) (a2b2)(b2a2)

(C) (2x2y1)(2x2y1) (D) (x22y)(2xy2) 19.下列多项式乘法中可以用平方差公式计算的是( ) (A) (ab)(ab) (B)(x2)(2x)

(C) (1xy)(y133x)(D) (x2)(x1)

20.下列计算不正确的是( )

(A) (xy)2x2y2 (B) (x)2x21x1 2x24.(1)已知x(x1)(x2y)2, (2)如果

22(C) (ab)(ba)a2b2 (D) aab15,bab6

(xy)2x22xyy2

21.化简:(ab)(ab)(bc)(bc)(ca)(ca)

22.化简求值:(2x1)(x2)(x2)2(x2)2,其中x112

23.解方程:

(13x)2(2x1)213(x1)(x1)

求x2y22xy的值; 求a2b2和a2b2的值

1.计算:

(1)(a- 2b+c)(a+2b-c)-(a+2b+c)2;

(2)(x+y)4(x-y)4;

(3)(a+b+c)(a2+b2+c2-ab-ac-bc).

2.化简:

(1)(2x-y+z-2c+m)(m+y-2x-2c-z);

(2)(a+3b)(a2-3ab+9b2)-(a-3b)(a2+3ab+9b2);

(3)(x+y)2(y+z-x)(z+x-y)+(x-y)2(x+y+z)(x+y-z).

3.已知z2=x2+y2,化简(x+y+z)(x-y+z)(-x+y+z)(x+y-z).

4.已知a,b,c满足abc0,abc8,那么111abc 的值是

(A)正数; (B)零 (C)负数 (D)正负不能确定

5.若实数a,b,c满足a2b2c29,则代数式

(ab)2(ac)2(bc)2的最大值是

(A)27; (B)18; (C)15; (D)12.

6.已知1(bc)2(ab)(ca),且a0,则bc4a

7.已知abc6,a2b2c214,a3b3c336,求abc的值.

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