Bài 5: Cho tam giác ABC vuông tại A (AB < AC). Lấy D thuộc tia BC sao cho BD=BA. Từ D kẻ đường thẳng vuông góc với BC cắt AC tại M. a) Chứng minh: tam giác AMB và tam giác DMB b) Gọi N là giao điểm của tia BA và tia DM. Chứng minh: tam giác BNC cân. c) Gọi I là trung điểm của đoạn thẳng NC. Chứng minh 3 điểm B, M, I thẳng hàng. ai làm được mình vót năm sao ;) *****

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