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dung1308
2 năm trước
Cho tam giác ABC có AC=AB, kẻ AH vuông góc với BC(H thuộc BC).Từ h kẻ đường thẳng song song với AC, cắt BC tại D . Gọi G là giao điểm của CD,AH và G là trọng tâm, tam giác ADH cân cảm ơn các bạn rết nhiều nhé
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