C1第一章:《整式的乘除》提高练习题(七下)

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2014-2015学年七年级数学科寒假作业(一)

座号 姓名

一、填空题

1.a 6

·a 2

÷(-a 2

)3

=________. 2.( )2

=a 6b 4n -2

. 3. ______·x

m -1=x

m +n +1

4.(2x 2

-4x -10xy )÷( )=

21x -1-2

5

y . 5.x 2n

-x n

+________=( )2

. 6.若3m

·3n

=1,则m +n =_________.

7.已知x m

·x n

·x 3

=(x 2

)7

,则当n =6时m =_____ __. 8.若x +y =8,x 2y 2

=4,则x 2

+y 2

=____ _____. 9.若3x

=a ,3y

=b ,则3

x -y

=_________.

10.[3(a +b )2

-a -b]÷(a +b )=_____ ____. 11.若2×3×9m

=2×311

,则m =___________.

12.代数式4x 2+3mx +9是完全平方式则m =___________. 二、选择题(每小题2分,共计16分)

13.计算(-a )3

·(a 2

)3

·(-a )2

的结果正确的是( )

(A )a 11

(B )a 11

(C )-a 10

(D )a 13

14.下列计算正确的是( )

(A )x

2(m +1)÷x

m +1

=x 2 (B )(xy )8÷(xy )4=(xy )2

(C )x 10÷(x 7

÷x 2

)=x 5

(D )x 4n

÷x 2n

·x 2n

=1 15.4m

·4n

的结果是( )

(A )2

2(m +n )

(B )16mn (C )4mn (D )16

m +n

16.若a 为正整数,且x 2a

=5,则(2x 3a

)2

÷4x 4a

的值为( )

(A )5 (B )

2

5

(C )25 (D )10 17.下列算式中,正确的是( )

(A )(a 2b 3

)5

÷(ab 2

)10

=ab 5

(B )(

31)-2=23

1=91 (C )(0.00001)0

=(9999)0

(D )3.24×10-4

=0.

18.(-a +1)(a +1)(a 2

+1)等于( ) (A )a 4

-1

(B )a 4

+1

(C )a 4+2a 2+1 (D )1-a 4

19.若(x +m )(x -8)中不含x 的一次项,则m 的值为( ) (A )8 (B )-8 (C )0 (D )8或-8 20.已知a +b =10,ab =24,则a 2+b 2

的值是( ) (A )148 (B )76 (C )58 (D )52

三、计算

21.①(

32a 2b )3÷(31ab 2)2×43a 3b 2; ②(4x +3y )2-(4

x -3y )2

③(2a -3b +1)2; ④(x 2-2x -1)(x 2

+2x -1);

⑤(a -

61b )(2a +31b )(3a 2+12

1b 2); ⑥[(a -b )(a +b )]2÷(a 2-2ab +b 2

)-2ab .

22.化简求值:[(x +21y )2+(x -21y )2](2x 2

-2

1y 2),其中x =-3,y =4. 四、计算

23.9972

-1001×999. 24.(1-221)(1-231)(1-241)…(1-291)(1-20

11

)的值.

五、解答题 25.已知x +x 1=2,求x 2+21x ,x 4

+41x

的值.

26.已知(a -1)(b -2)-a (b -3)=3,求代数式2

2

2b a -ab 的值.

27.已知x 2

+x -1=0,求x 3

+2x 2

+3的值.

28.若(x 2

+px +q )(x 2

-2x -3)展开后不含x 2

,x 3

项,求p 、q 的值.

《整式的乘除》提高练习题

一、填空题

1.a 6

·a 2

÷(-a 2

)3

=________.【答案】-a 2

. 2.( )2

=a 6b 4n -2

.【答案】a 3b

2n -1

. 3. ______·x

m -1

=x m +n +1

.【答案】x

n +2

4.(2x 2

-4x -10xy )÷( )=

21x -1-2

5

y .【答案】4x . 5.x 2n -x n +________=( )2.【答案】41;x n

-2

1.

6.若3m

·3n

=1,则m +n =_________.【答案】0.

7.已知x m

·x n

·x 3

=(x 2

)7

,则当n =6时m =_______.【答案】5. 8.若x +y =8,x 2y 2

=4,则x 2

+y 2

=_________.【答案】60或68. 9.若3x

=a ,3y

=b ,则3

x -y

=_________.【答案】

b

a

. 10.[3(a +b )2

-a -b]÷(a +b )=____ _____. 【答案】3(a +b )-1. 11.若2×3×9m

=2×311

,则m =___________. 【答案】5.

12.代数式4x 2+3mx +9是完全平方式则m =___________. 【答案】±4. 二、选择题

13.计算(-a )3

·(a 2

)3

·(-a )2

的结果正确的是( )

(A )a 11

(B )a 11

(C )-a 10

(D )a 13

【答案】B .

14.下列计算正确的是( )

(A )x

2(m +1)÷x

m +1

=x 2 (B )(xy )8÷(xy )4=(xy )2

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