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bayduchuynh7
2 năm trước
Vẽ hình bài này cho mik vs : Cho tam giác ABC , M là trung điểm BC .Từ B và C kẻ các đường thẳng BE , CF vuông góc với AM . Chứng minh : a) ME = MF và BE = CF b) BE//CF c) M là trung điểm EF
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