ĐỀ KIỂM TRA ĐẠI SỐ 9 TIẾT 59

Họvà tên:................................................................
Lớp:9...........
KIỂM TRA 45 PHÚT
MÔN:TOÁN ĐẠI 9
Điểm:



Lờiphêcủagiáoviên:

ĐỀ BÀI:
Câu 1: (3đ)Chophươngsau: x2-2x-3=0 (1)
Xácđịnhhệsốa,b,c.
Dùnghệthức Vi-éthãytínhbiểuthứcsau: x13 + x23.
Nhẩmnghiệmcủaphươngtrình (1).
Câu 2: (3đ)Chohaihàmsốsau : y=-x2và y=x+2.
Vẽđồthịcủahaihàmsốtrêncùngmộtmặtphẳngtọađộ
Tìmtọađộgiaođiểmcủahaiđườngthẳngtrên.
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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