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minhvando123456789
2 năm trước
Cho ΔABC cân tại A,kẻ AH ⊥ BC tại H a)CM: ΔAHB= ΔAHC b)Từ H kẻ HM ⊥AB, HN ⊥ AC ,AH cắt MN tại K CM:AH ⊥MN c)Trên tia đối của HM lấy HP sao cho H là trng điểm MP.NP cắt BC tại E. NH cắt ME tại O CM:P,Q,K thẳng hàng
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