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daicasanco45
2 năm trước
cho ΔABC cân tại A(Góc A ∠90Độ) kẻ hai đường cao BE và CD(E ∈AC,D ∈AB) Chứng minh a, ΔBDC= ΔCEB B,AD=AE C,DE//BC D,Gọi H là giao điểm của BC và CD.Gọi M là trung điểm của BC,chứng minh ba điểm A,H,M thẳng hàng
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