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Lớp 9:
Bài kiểm tra học kì II môn toán 9
(Thời gian làm bài 90 phút)
Điểm Nhận xét
Đề bài
Bài 1(2 điểm):
Gải các phơng trình, hệ phơng trình sau:
a)
2 10
5 2 2
x y
x y
+ =


=

b) x
2
+ 3x + 2 = 0
Bài 2 (2 điểm):
Cho phơng trình mx
2
5x 5 = 0
a) Tìm m để phơng trình có hai nghiệm.
b) Với m tìm đợc ở trên gọi x
1
, x
2
là hai nghiệm của phơng trình. Tính

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