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naruto
2 năm trước
Cho hình bình hành ABCD(AB>BC) có M,N lần lượt là trung điểm của AB, CD a)Chứng minh: AMCN là hình bình hành b) Chứng minh:AC, BD, MN đồng quy c) Gọi E là giao điểm của AD và MC.chứng minh:AM là đường trung bình của tam giác ECD
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