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leanhquan123
2 năm trước
Cho tam giác ABC cân tại A. Trên tia đối của tia BC lấy điểm D, trên tia đối của tia CB lấy điểm E sao cho BD=CE.Kẻ BH vuông góc với AD (H ∈ AD) ,kẻ CK vuông góc với AE (K ∈ AE).Chứng minh rằng: a) Tam giác ABD = tam giác ACE b) BH=CK
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