Tiet 59, dai so 9

Họ tên:…………………………………..

KIỂM TRA 1 TIẾT ĐẠI SỐ 9

LỚP: 9/….
TIẾT THỨ: 59 (CHƯƠNG 3)


ĐIỂM:



NHẬN XÉT:


ĐỀ 1:
Bài 1(3,0điểm): Giải các phương trình sau:
a) 2x2 – 7x + 3 = 0; b) x2 + 3x + 1 = 0; c) x2 + 7x + 6 = 0
Bài 2(2,0điểm): Cho hàm số y = - x2 và y = x - 2
Vẽ đồ thị hàm số trên cùng một mặt phẳng tọa độ.
Xác định tọa độ giao điểm của hai đồ thị hàm số bằng phương pháp đại số
Bài 3(2,0điểm): Tìm hai số biêt tổng bằng 12 và tích bằng 32
Bài 3(3,0điểm): Cho phương trình: x2 – mx + m - 3 = 0 (1)
Giải phương trình với m = 4
Chứng minh rằng phương trình (1) có hai nghiệm phân biệt
;
với mọi m
Tìm m để B =
2+
2 có giá trị nhỏ nhất? Tìm giá trị nhỏ nhất đó?
BÀI LÀM
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Họ tên:…………………………………..

KIỂM TRA 1 TIẾT ĐẠI SỐ 9

LỚP: 9/….
TIẾT THỨ: 59 (CHƯƠNG 3)


ĐIỂM:



NHẬN XÉT:


ĐỀ 2:
Bài 1(3,0điểm): Giải các phương trình sau:
a) 3x2 + 5x - 1 = 0; b) x2 - 3x + 1 = 0; c) x2 + 7x – 8 = 0
Bài 2(2,0điểm): Cho hàm số y = x2 và y = x + 2
Vẽ đồ thị hàm số trên cùng một mặt phẳng tọa độ.
Xác định tọa độ giao điểm của hai đồ thị hàm số bằng phương pháp đại số
Bài 3(2,0điểm): Tìm hai số biêt tổng bằng 10 và tích bằng 16
Bài 3(3,0điểm): Cho phương trình: x2 – mx + m - 2 = 0 (1)
Giải phương trình với m = 6
Chứng minh rằng phương trình (1) có hai nghiệm phân biệt
;
với mọi m
Tìm m để A =
2+
2 có giá trị nhỏ nhất? Tìm giá trị nhỏ nhất đó?
BÀI LÀM
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