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anhhungpro100
2 năm trước
cho tam giác abc cân tại a, 2 điểm d và e lần lượt thay đổi trên ab,bc.gọi f là chân đường vuông góc của c trên bc.biết ef=bc/2.cmr đường thẳng qua e và vuông góc de luôn đi qua 1 điểm cố định
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