De KT dai 15 pt chuong 4

Họ và tên…………………. Bài kiểm tra 15 ph
Lớp: 9…. Môn: Toán – Đại số 9












Đề số 1
I. TRẮC NGHIỆM(3 đ)
: Nếu phương trình bậc hai ax2 + bx + c = 0 có một nghiệm bằng -1 thì:
A. a + b + c = 0.
B. a – b + c = 0.
C. a + b – c = 0.
D. a – b – c = 0.

Câu 2: Tập nghiệm của phương trình x2 + 5x – 6 = 0 là :
A. (– 1; 6( B.(1; - 6( C. (– 1; 6( D.(1;-6(
Câu 3: Cho hai số u và v thỏa mãn điều kiện u + v = 5; u.v = 6. Khi đó u, v là hai nghiệm của phương trình
A. x2 + 5x + 6 = 0.
B. x2 – 5x + 6 = 0. C. x2 + 6x + 5 = 0. D. x2 – 6x + 5 = 0.

Câu 4: Phương trình x2 – 4x – 5 = 0 có 2 nghiệm là:
A. x1 = 1; x2 = - 5
B. x1 = -1;x2 = -5
C. x1 = -1; x2 = 5
D. x1 = 1; x2 = 5

Câu 5: Gọi x1; x2 là nghiệm của phương trình 4x2 – 5x + 8 = 0. Khi đó x1 + x2 là:
A.

B.

C.

D. Cả A,B,C đều sai

Câu 6: Cho phương trình 5x2 – 7x + 2 = 0. Khi đó tổng và tích hai nghiệm là :
A. S = - ; P = B. S = ; P = - C. S = ; P = D. S = - ; P =
II. TỰ LUẬN (7 đ) : Giải các phương trình sau:
a) b) x4 - 5x2 + 4 = 0 c

Bài làm
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Họ và tên…………………. Bài kiểm tra 15 ph
Lớp: 9…. Môn: Toán – Đại số 9












Đề số 2
I. TRẮC NGHIỆM(3 đ)
: Nếu phương trình bậc hai ax2 + bx + c = 0 có một nghiệm bằng 1 thì:
A. a + b + c = 0.
B. a – b + c = 0.
C. a + b – c = 0.
D. a – b – c = 0.

Câu 2: Tập nghiệm của phương trình x2 + 4x – 5 = 0 là :
A. (– 1; 5( B.(1; - 5( C. (– 1; 5( D.(1; -5(
Câu 3: Cho hai số u và v thỏa mãn điều kiện u + v = - 5; u.v = 6. Khi đó u, v là hai nghiệm của phương trình
A. x2 + 5x + 6 = 0.
B. x2 – 5x + 6 = 0. C. x2 + 6x + 5 = 0. D. x2 – 6x + 5 = 0.

Câu 4: Phương trình x2 – 5x + 6 = 0 có 2 nghiệm là:
A. x1 = 2; x2 = - 3
B. x1 = -2;x2 = -3
C. x1 = -2; x2 = 3
D. x1 = 2; x2 = 3

Câu 5: Gọi x1; x2 là nghiệm của phương trình 4x2 – 3x + 5 = 0. Khi đó x1 + x2 là:
A.

B.

C.

D. Cả A,B,C đều sai

Câu 6: Cho phương trình 4x2 – 7x + 3 = 0. Khi đó tổng và tích hai nghiệm là :
A. S = - P = B. S = P = - C. S = P = D. S = - P =
II. TỰ LUẬN (7 đ) .Giải các phương trình sau:
a) b) x4 - 5x2 + 4 = 0 c

Bài làm
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