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