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nguyenducthang169207
2 năm trước
1.Cho tam giác ABC có E,F lần lượt là trung điểm của AB,AC a, Tính EF nếu AB= 8CM b, Tính BC nếu EF= 5cm 2, Cho tam giác ABC gọi D,E,F lần lượt là trung điểm của AB,BC,CA .Chứng minh a, Tứ giác ADEF có các cạnh đối song song và bằng nhau b, AE đi qua trung điểm của DF GIẢI GIÚP
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