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diepphamdiep1
2 năm trước
Cho tam giác ABC cân tại A Trên tia đối của tia BC lấy điểm M Trên tia đối của tia CB lấy điểm N Sao cho BM = CN a)CM: tam giác AMN cân b)kẻ BH vuông AM,kẻ CK vuông AN .CMR BH=CK c)CM:AH=AK d)gọi O là giao điểm của HB và KC . Tam giác OBC là tam giác gì?vì sao?
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