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Cho ΔABC vuông tại A có AB = 8 cm , AC = 6 cm , trung tuyến AM. Kẻ MD vuông góc với AB và ME vuông góc với AC. a/ Tứ giác ADME là hình gì ? Vì sao ? b/ Tìm điều kiện của tam giác ABC để tứ giác ADME là hình vuông. c/ Tính diện tích ΔABM
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