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    Nguồn:
    Người gửi: Đào Quang Đại (trang riêng)
    Ngày gửi: 14h:49' 26-09-2013
    Dung lượng: 64.0 KB
    Số lượt tải: 52
    Số lượt thích: 0 người
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    Lớp: 9… Học sinh:




    Điểm
    Lời phê của giáo viên
    
    
    Câu 1 (3đ): Giải các phương trình sau:
    a) x2 + 2x = 0 b) 3x2 - 27 = 0 c) x2 - 8x + 15 = 0
    Câu 2 (2đ): Cho phương trình x2 + 2(m - 1)x + m2 = 0 tìm m để:
    a) Phương trình có hai nghiệm phân biệt.
    b) Phương trình có nghiệm kép.
    c) Phương trình vô nghiệm.
    Câu 3 (2đ): Giải bài toán sau bằng cách lập phương trình.
    Tính các cạnh góc vuông của một tam giác vuông biết cạnh huyền của tam giác vuông đó bằng 10 cm, hai cạnh góc vuông hơn kém nhau 2 cm.
    Câu 4 (2đ): Cho ( ABC nhọn nội tiếp đường tròn (O), các đường cao BE, CF.
    Chứng minh tứ giác BFEC nội tiếp. Xác định tâm I của đường tròn ngoại tiếp tứ giác.
    Kẻ tiếp tuyến x’Ax. Chứng minh x’x // EF
    Bài làm

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