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rewwrewrwerew
2 năm trước
Cho tam giác ABC cân tại A,đường cao AH=2cm,B=8cm.Đường vuông góc với AC tại c cắt đường thẳng Ah ở D a,CM các điểm B,c cùng thuộc đường tròn đường kính AD b,Tính đoạn thẳng AD
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