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2 năm trước
Cho tam giác ABC .Trên cạnh BC lấy điểm D" trên cạnh AC lấy điểm E sao cho $\frac{AD}{AB}$ = $\frac{AE}{AC}$ " trung tuyến AM (MEBC )cắt đoạn thẳng ED tại O.CM:OD=OE.
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