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dinhvananh.08102001
2 năm trước
Cho tam giác ABC ; M là trung điểm của AB, N là trung điểm của AC. Trên tia đối của tia NB lấy điểm D sao cho ND = NB. Trên tia đối của tia MC lấy điểm E sao cho ME = MC. P là trung điểm của BC, Q là trung điểm của AD. Chứng minh rằng: a) AD = AE b) E, A, D thẳng hàng. c) Ba điểm P, N, Q thẳng hàng.
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