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2 năm trước
Cho tam giác ABC vuông tại A với BC = 6 cm, AC = 4 cm. Kẻ tia Cx vuông góc với BC (tia Cx và điểm A nằm khác phía so với đường thẳng BC). Trên tia Cx lấy điểm D sao cho BD = 9 cm. a) Chứng minh BD // AC b) Tính tỉ số diện tích của hai tam giác: ABC và BDC
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