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momcoi1003
2 năm trước
Cho tam giác ABC cân tại A ( AB=AC). Gọi D, E lần lượt là trung điểm của AB và AC a, chứng minh tam giác ABE=tam giác ACD b, chứng minh BE=CD c, Gọi k là giao điểm của BE và CD chứng minh tam giác KBC cân tại k
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