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anhquanle133
2 năm trước
Cho tam giác ABC có 3 góc nhọn nội tiếp đường tròn tâm Ở bán kính R và AH là đường cao tam giác ABC.Gọi M,N thứ tự là hình chiếu của H trên AB,AC. Cho biết AH=R√2. Chứng minh M,O,N thẳng hàng
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