Giáo án Kiểm tra 45 phút môn: Toán đại 9

Họ và tên:................................................................ 
Lớp:9...........	
KIỂM TRA 45 PHÚT
MÔN:TOÁN ĐẠI 9
Điểm:
Lời phê của giáo viên:
ĐỀ BÀI:
Câu 1: (3đ)Cho phương sau: x2-2x-3=0 (1)
Xác định hệ số a,b,c.
Dùng hệ thức Vi-ét hãy tính biểu thức sau: x13 + x23.
Nhẩm nghiệm của phương trình (1).
Câu 2: (3đ)Cho hai hàm số sau : y=-x2 và y=x+2.
Vẽ đồ thị của hai hàm số trên cùng một mặt phẳng tọa độ
Tìm tọa độ giao điểm của hai đường thẳng trên.
Câu 3 ( 2đ) : Cho phương trình (1) (x là ẩn số) 
a) Chứng minh phương trình (1) luôn có 2 nghiệm trái dấu
b) Gọi x1, x2 là các nghiệm của phương trình (1):Tính giá trị của biểu thức : 
 Câu 4:(1đ) Giải và biện luận phương trình sau:
a-a+x =x (a là tham số)
BÀI LÀM:
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