Đề kiểm tra chương I- Đại số 9
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Trờng THCS Hải Tây
Họ và tên :......................................
Lớp : 9......................................
Chữ ký PHHS :..............................
Kiểm tra môn : Đại số 9
Thời gian: 45phút
Bài số :.......
Ngày .......tháng.......năm 200.....
Đề chẵn:
I. Trắc nghiệm:
Khoanh tròn vào chữ đứng trớc đáp án đúng trong các câu từ câu 1 đến câu 5.
Câu 1 Số có căn bậc hai số học của nó bằng 9 là:
A. -3 B. 3 C. -81 D. 81
Câu 2: Căn thức
( )
2
2x
bằng:
A. x -2 B.
|2x|
C. 2 - x D. (x - 2); (2- x)
Câu 3: Biểu thức
x32
xác định với các giá trị:
A.
3
2
x
B.
3
2
x
C.
3
2
x
D.
3
2
x
Câu 4: Giá trị của biểu thức
32
1
32
1
+
+
bằng:
A. 0 B.
32
C. 4
D.
5
32
Câu 5: Nếu
3x4x9
=
thì x bằng:
A. 3
B.
5
9
C. 2 D. 9
II. Tự luận:
Câu 7: Tính giá trị biểu thức:
( )
10
1
32505.5250
++
Câu 8: Cho biểu thức:
+
+
=
1a
2a
2a
1a
:
a
1
1a
1
P
Với a > 0, a
1, a
4
a) Rút gọn P
b) Tìm a để P =
4
1
Bài làm
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