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Trangkutihh
1 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 vơi AD tại H,kẻ CK vuông góc với AE tại K.Gọi I là giao điểm của hai đường thẳng BH và CK. Chứng minh rằng a)tam giác ABH=tan giác ACK b)AI là tia phân giác của gócDAE c)HK//DE
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