cho tam giác ABC cân tại A lấy 1 điểm D trên tia đối của tia CA lấy 1 điểm E sao cho BD=CE.Đường thẳng DE cắt BC ở F. Chứng minh DF=EF
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
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xin lỗi mk ko bt giải vì chưa ok
ai như vậy thì k mk nha
cái nịt