Kiểm tra một tiết chương IV lớp: 9a môn: Đại số

Trường THCS Xuân áng Kiểm tra một tiết Chương iv
Lớp: 9A Môn: Đại số
Họ và tên: ______________________________ 
 Điểm
 Lời phê của thầy (cô) giáo
Đề bài.
Câu 1 (1,5đ): Cho hàm số y = ax2 hãy xác định hệ số a biết hàm số đi qua điểm (2 ; 2).
Câu 2 (4,5đ): Giải các phương trình sau 
x2 - 4x + 3 = 0
4x2 - 8x - 5 = 0
-25x2 + 13x + 12 = 0
Câu 3 (1đ): Tìm hai số a và b biết : a + b = 5 và a.b = -6
Câu 4 (3đ): Cho phương trình x2 - 2(m - 1)x + m2 - 3m + 4=0
 a) Tìm m để phương trình có nghiệm x = 1
 b) Tìm m để phương trình có 2 nghiệm thoả mãn hệ thức
Bài làm
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