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Bikipthevinh
2 năm trước
câu 2:cho tam giác ABC vuông ở A(AB<AC),đường cao AH .gọi D là điểm đối xứng vs D qua H.đường thẳng kẻ qua D song song vs AB cắt BC và AC lần lượt ở M và N .chứng minh a, tứ giác ABDM là hình thoi b,AM vuông góc vs CD c, gọi I là trung điểm của MC ,chứng minh IN vuông góc vs HN( lm xong mk tặng 5 sao nhé)
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