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huyenxx1601
2 năm trước
Hình bình hành ABCD có O là giao điểm 2 đường chéo M, N lần lượt là trung điểm OB và OD a/ Chứng minh: AMCN là hình bình hành b/ AM cắt BC ở E, CN cắt AD ở F. Chứng minh: AC, BC, EF đồng qui
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