黑龙江省哈尔滨市第一二五中学人教版（上）期末辅导八年级数学综合复习题 （PDF版，含答案）.docx

综合复****题（二）
一、选择题
1
2
A
3
D
4
D
5
C
6
B
7
D
8
B
9
C
10
B
B
二、填空题
11
12
13
18
14
15
x = - 3
2
x = 5
1.3´10 -3
a(x -2y)(x + 2y)
2 2
16
6
17
19
20
5
1
4
1或4
2
20题详解：

三、解答题
21.(1)2(x
= 2x - 27x
= 0-------1'
2
)
3
×x
3
-(3x
3
)
3
+(5x)
2
×x
7
(2)x y
2 -3(x-1y)3
9
9
+ 25x
9
------2'
2
= x y-3
x
-3
y
3
------1'
= x-1 ------1'
1
=
x
22.(1)(p -4)(p +1) +3P
(2)4xy
= -y(y
= -y(y -2x)
2
-4x
-4xy + 4x )------1'
2
------2'
2
y - y
3
= p
= p
2
-3p - 4+3P ------1'
- 4-----1'
2
2
2
= (p + 2)(p -2)------1'

23.çæ 2
+
a +2 ö a
¸
÷
è a +1 a
2
-1ø a -1
é 2(a -1)
a + 2
ù· a -1-------------1'
=
=
=
+
ê
ú
(a +1)(a -1) (a +1)(a -1)û
a
ë
3a
· a -1-----------1'
a
(a +1)(a -1)
3
-----------1'
a +1
a = (-
1
2
)
-3 +(- 3)
0
= -8+1-----------2'
= -7----------1'