De kiem tra 45p(dai 9)

Trường THCS Việt Tiến Bài kiểm tra : 45 phút
Họ và tên: .......................................... môn: Đại số 9
Lớp: 9B Ngày kt: 19/10/2011.
Ngày trả :.......................
Phần I : Trắc nghiệm khách quan.( 3 điểm)
Hãy khoanh tròn vào chữ cái đứng đầu đáp số đúng trong các câu sau :
Câu 1: có nghĩa khi :
A. x = 2; B. x
2; C. x < 2; D. x > 0.
Câu 2 : Số 49 có căn bậc hai số học là :
A. 7; B. – 7 ; C. 7 ; D. 81;
Câu 3 : (
+
).(
-
) bằng :
A. 23; B. 21; C. 3 ; D. 8.
Câu 4 :
bằng :
A. a; B. – a; C.
a; D.
.
Câu 5: Phương trình
= 2 có nghiệm là :
A. x = 2; B. x = - 2 ; C. x = 1; D. x =
2.
Câu 6: Nếu
-
= 3 thì x bằng :
A. 3; B.
; C. 9; D. Kết quả khác.
Phần 2 : Tự luận. ( 7 điểm)
Bài 1 :
a/ Trục căn thức ở mẫu : b/ Tính : (5
+ 2
).
-

.
Bài 2: Giải phương trình :
a= 3. b/
+
= 10.
Bài 3: Cho biểu thức P =

a/ Tìm x để biểu thức p có nghĩa? b/ Rút gọn P.
Bài làm
................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................