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thangkt1234
2 năm trước
Cho tam giác ABC,2 trung tuyến BM,CN cắt nhau tại G.Gọi E,F lần luọt là trung điểm của GB và GC. a, Chứng minh MNEF là hình bình hành b, Lấy I,J thuộc tia đối của MG và NG sao cho MI=MG và NI=NG.Chứng minh tứ giác BCIJ là hình bình hành
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