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tranthiqueluhan
2 năm trước
cho tam giác abc cân tại a có đường cao ah. gọi g là trọng tâm của tam giác tam giác abc, trên tia đối của tia hg lấy điểm e sao cho hg=he a)CM:BG=GC=BE=CE Ko dùng tứ gíac nhé
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