北师大版七年级数学下册整式运算练习题(最新整理)

北师大版七年级数学下册整式运算练习题(最新整理)
北师大版七年级数学下册整式运算练习题(最新整理)

整式的运算检测题

一、 填空题:

1.已知a - 1

= 1,则a 2 + 1

=

a

a 2

a 4 + 1 =

a 4

2.若m + n = 10 , mn = 24 ,则m 2 + n 2 =

.

3. (3x + 2 y )2 -

=(3x - 2 y )2 .

4.若2m = 3, 4n = 8 ,则23m +2n -1 = .

5.若x - y = 8, xy = 10 ,则x 2 + y 2 = .

6.当k =

时,多项式x 2 - 3kxy - 3y 2 - 1 xy + 8 中不含xy 项.

3

7. ( y - x )2n ? (x - y )n -1 (x - y ) =

.

8、若 m - 2 + n 2 - 8n + 16 = 0 ,则m =

, n =

9、若x 2 + 2(m - 3) + 16 是关于x 的完全平方式,则m =

10、边长分别为a 和2a 的两个正方形按如图(I)的样式摆放,则图中阴影部分的面积为

11. (2 +1)(22 +1)(24 +1) 的结果为 .

二、选择题:

12. 如果(3x 2 y -2xy 2 )÷M=-3x+2y ,则单项式 M 等于( )

A 、 xy ;

B 、-xy ;

C 、x ;

D 、 -y

-2

13.若 a = (-0.4)2

, b = -4-2

, c =?

1 ? ,d =?

1 ?

, 则 a 、b 、c 、d 的大小关

- ?

? 4 ?

- ? ? 4 ?

系为(

(A) a

?÷ -? + (x -π) - -?÷ (-2)

?5 ??4 ? ?2 ?

2..已知:x 2+xy = 12 ,xy +y 2= 15 ,求(x +y)2 -(x +y)(x -y)的值.

3.已知:a(a-1)-(a2-b)= -5 求: 代数式 a 2 + b 2 -ab 的值.

2

4.已知a 2+b 2- 2a + 6b + 10 = 0 ,求a2006-1 的值

b

6.请先观察下列算式,再填空:32-12= 8 ?1,52- 32= 8 ? 2 .

①72- 52=8×;②92-()2 =8×4;③()2 -9 2 =8×5 ④132-()2 =8×;………

⑴通过观察归纳,你知道上述规律的一般形式吗?请把你的猜想写出来.

四、先化简,再求值(每小题7 分,共计14 分)

1、(2a + 3b)(2a - 3b) + (a - 3b)2,其中a =-5, b =1 。

3

2、已知A =1 x 2-x + 5, B = 3x -1+x 2,

3当x =2 时,求

3

A - 2

B 的值。

五、利用整式的乘法公式计算:(每小题 2 分,共计4 分)

① 1999 ? 2001 ②992-1

六、(4 分)在一次水灾中,大约有2.5 ?105个人无家可归,假如一顶帐篷占地100 米2 ,可以放置40 个床位,为了安置所有无家可归的人,需要多少顶帐篷?这些帐篷大约要占多少地方?估计你的学校的操场可安置多少人?要安置这些人,大约需要多少个这样的操场?

七、探究题:(每小题 5 分,共计10 分)

1、求(2 -1)(2 +1)(22+1)(24+1)(28+1) (232+1) +1 的个位数字。

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At the end, Xiao Bian gives you a passage. Minand once said, "people who learn to learn are very happy people.". In every wonderful life, learning is an eternal theme. As a professional clerical and teaching position, I understand the importance of continuous learning, "life is diligent, nothing can be gained", only continuous learning can achieve better self. Only by constantly learning and mastering the latest relevant knowledge, can employees from all walks of life keep up with the pace of enterprise development and innovate to meet the needs of the market. This document is also edited by my studio professionals, there may be errors in the document, if there are errors, please correct, thank you!

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