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DE TOAN KSCL LOP 8

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ĐỀ THI KHẢO SÁT CHẤT LƯNG ĐẦU NĂM
MÔN: TOÁN; Đề: chẳn ; Lớp 8; Ngày thi : 16/09/2006
Thời gian làm bài : 60 phút ( Không kể thời gian phát đề )
Trường THCS Nguyễn Bỉnh Khiêm
Lớp :….
Họ tên thí sinh :……………… ………
Lời phê của GV : ĐIỂM
I.Trắc nghiệm: (4đ)
Câu 1: Đánh dấu “X” vào ô mà em chọn (1 điểm )
Câu Nội dung Đ S
1
3x
2
(2x
3
– 5x) = 6x
5
– 15 x
3
2
(5x
4
– 2x
3
+ 2)x = 5x
4
– 2x + 2
3
(5xy – x
2
+ y).


5
2
= 2xy -
5
2
x
2
+
5
2
y
4
4x
2
y .( 2x
2
y
2
– 3xy) = 8xy – 12x
3
y
2
Bài 2 : Điền vào chổ trống (1 đ)
1 / Muốn nhân một đa thức với 1 đa thức .........................................................
của đa thức kia ..................................................................................................
2/ Hình thang cân là ..........................................................................................
............................................................................................................................
Bài 3 : Khoanh tròn vào câu trả lời đúng (2đ).
Câu 1 :Tổng các góc của một tứ giác bằng .
a/ 630

o
b/ 360
o
c/ 180
o
d/ 306
o

Câu 2 : Cho tứ giác ABCD có
góc C = 100
o
; góc B = 70
o
; góc A = 130
o
thì
a/ góc D = 90
o
; b/ góc D = 60
o
; c/ góc D = 50
o
; d/ góc D = 70
o

Câu 3 : Cho hình thang ABCD (AB // CD) có .
Góc A = 120
0
thì
a/ góc D = 60

o
; b/ góc D = 50
o
; c/ góc D = 70
o
; d/ góc D = 40
o

Câu 4 : (5x
3
– 4xy + x)(-
5
1
xy) =
a/ xy
4
-
5
4
x
2
y
2
+
5
1
x
2
y b/ x
4

y + 5x
2
y
2
+ x
2
y
c/ x
4
y - 4x
2
y

+ 5x
2
y d/ - x
4
y +
5
4
x
2
y
2
-
5
1
x
2
y

II/ Tự luận (6 đ)
A/ Đại số (3đ)
Bài 1 : Rút gọn rồi tính giá trò biểu thức (2 đ)
A = (x
2
– 8 ) x + 2 – x
3
tại x = - 1
B = (x
2
+ 1 ) (x - 3y + 2) – x (x
2
- 3xy + 2x ) tại x=2 ; y=-1
Bài 2 : Tìm x biết ( 1đ )
5x ( 4x – 3 ) -2x ( 10x – 5 ) = 30
B/ Hình học : ( 3đ )
Bài 3 : Cho tứ giác ABCD biết rằng góc
^
A
= 130
0
; góc
^
D
= 50
0
a. Chứng minh tứ giác ABCD là hình thang .
b. Tính các góc
^
B

và góc
^
C
biết góc
^
B
= 2
^
C
c. Gọi BE là tia phân giác của
^
ABC
. Chứng minh  BEC đều .
Bài làm
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