Kiểm tra chương 1

Phòng GD-ĐT Cầm Mỹ
Trường THCS Sơng Nhạn
Họ & tên: _____________________________
Lớp 9/___
ĐỀ KIỂM TRA 1 TIẾT
Mơn: Đại Số 9
Điểm Nhận xét của thầy giáo
I./ Trắc nghiệm : ( 4 điểm)
Bài 1
1) Chỉ ra mợt câu SAI trong các câu sau
A)
0 0=
B)
4−
vơ nghĩa C)
4−
= - 2 D)
4−
= 2
2) Chỉ ra mợt câu SAI
A)
2 3>
B
2
0,36 0,6a a=
nếu a < 0
C)
1 2
2 2
=
D)

2. 8 4=
Bài 2: Chọn kết quả đúng nhất
3) Biểu thức
2
)31(
−
có giá trò là :
A. 1-
3
B. 1+
3
C.
3
-1 D.
2
4) Điều kiện xác đònh của căn thức
x26
−
là
A. x
≥
-3 B. x
≥
3 C. x
≤
-3 D. x
≤
3
5)
2

a
= ?
a/
2
a
= a nếu a
≥
0 B.
2
a
= -a nếu a
≤
0
C.
2
a
=
a
D. cả ba câu đều đúng
6) Nếu
x9x16
−
=0 thì x bằng :
A. 1 B.
7
C. 7 D. 49
7) A. Nếu x
2
= 9 thì x = -3 B. Nếu x
2

= 9 thì x = 3
C. Nếu x
2
= 9 thì x= -3 hoặc x = 3 D. cả ba câu đều đúng
8)
49.144.25 ?=
A. 42 B. 420 C. 0,42 D. 4,2
II./Tự luận: (6 điểm)
Bài 1: Rút gọn biểu
a)
3 2 4 18 2 32 50− + −
b)
7 14 15 5 1
:
1 2 1 3 7 5
 
− −
+
 ÷
 ÷
− − −
 
c)
3 3
3 1
+
+
Bài 2: Tìm x biết
a)
36 36 9 9 4 4 1x x x x+ − + + + = +

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Đáp án
I/ Trắc nghiệm. Mỗi câu chọn đúng đạt 0,5 điểm.
1 D 5 A
2 B 6 B
3 A 7 D
4 C 8 C
II/ T ự Luận
1.a 4.25-3.8 = 100-24 = 76 (1đ)
1.b 28.(76+15+9) = 28.100 = 2800 (1đ)
1.c 16.5-[131-9
2
] = 16.5-[131-81]

= 16.5-50 = 80-50=30 (1đ)
2.a 9.x+2 = 60:3 (1đ)
9.x+2 = 20
9.x = 20-2
9.x = 18
x = 18:9
x = 2
2.b 26-x = 75-71 (1đ)
26-x = 4
x = 26-4
x = 21
2.c 4
x
= 4
2
(1đ)
x = 2